Imagery of The Winter's Tale
When Leontes' jealousy erupts, he employs images of disease and poison. Railing against the immorality of women, he says, "Physic for't there's none" (Act 1, scene 2, line 200), i.e. it is like a disease for which there is no remedy. Leontes continues in the same speech, "many thousand on's, / Have the disease."

The poison image occurs when he compares himself to a man who has unwittingly drunk a spider that was in a cup. (It was believed that this was poisonous if the person was aware that he had swallowed the spider.) The images of disease and poison are appropriate for Leontes' jealous state of mind.

In the second part of the play, the dominant images change. Caroline Spurgeon comments in her book, Shakespeare's Imagery, that the imagery communicates a sense of "the common flow of life through all things, in nature and man alike the oneness of rhythm, of law of movement, in the human body and human emotions with the great fundamental rhythmical movements of nature herself" (p. 305). This is most noticeable in Act 4, in which images of nature dominate. It is as if the natural and human worlds come together in harmony, as well as the realm of the gods. This is of course appropriate, since the "disease" of Leontes' jealousy is being overcome by the natural tendency of life to regenerate itself. The nature images are especially apparent in the sheep-shearing scene (Act 4, scene 4), which shows a "green world" that is in marked contrast to the barren world of the first three acts. The images of nature that occur in Perdita's speeches show that she is completely aware of natural rhythms and their correspondence to human life. This can be seen for example in her distribution of flowers that are appropriate to the ages of the recipients (Act 4, scene 4, lines 103-28.

http://www.novelguide.com/thewinter'stale/metaphoranalysis.html

The study of the Winter's Tale

  The Winter's Tale is another famous masterpieces witten by Shakespeare. However, compared to Othello, it should be considered as a comedy, despite the fact that something unpleasure happened in the story. Here I would provide a website that involves a very excellent analysis of Winter's Tale. Please have a look.
http://www.novelguide.com/thewinter'stale/themeanalysis.html

http://www.shmoop.com/othello/themes.html
Please refer to this link, because there are other themes introduced by this website as well. And for each them it has offered certain questions already, just the examples I have posted below. Besides that, there are other information provided apart from the themes, such as summary, introduction, quotation and so on. I am sure it will be beneficial for your study of Othello.

Othello Theme of Jealousy

Othello is the most famous literary work that focuses on the dangers of jealousy. The play is a study of how jealousy can be fueled by mere circumstantial evidence and can destroy lives. (In Othello, the hero succumbs to jealousy when Iago convinces him that Desdemona has been an unfaithful wife – in the end, Othello murders his wife and then kills himself.) It is interesting that Iago uses jealousy against Othello, yet jealousy is likely the source of Iago's hatred in the first place. In Othello, jealousy takes many forms, from sexual suspicion to professional competition, but it is, in all cases, destructive.

Questions About Jealousy

1. What language does Shakespeare use to describe jealousy in the play? Do different characters use different metaphors to describe jealousy, or are there common ways of talking about it?
2. Do other characters besides Othello demonstrate jealousy? In what ways?
3. Is jealousy portrayed as intrinsically unreasonable? Is there a kind of jealousy that is reasonable, or does the play suggest that all jealousy tends to "mock" the person who is jealous?
4. Why is sexual jealousy the focus of the play, rather than a different kind of jealousy? What other kinds of jealousy are included in Othello? (If you're thinking of Iago's jealousy of Othello, keep in mind that this, too, could be sexual jealousy.)

http://www.shmoop.com/othello/jealousy-theme.html

Themes of Othello and the related questions

Othello Theme of Race

Othello is one of the first black heroes in English literature. A military general, he has risen to a position of power and influence. At the same time, however, his status as a black-skinned foreigner in Venice marks him as an outside and exposes him to some pretty overt racism, especially by his wife's father, who believes his daughter's interracial marriage can only be the result of Othello's trickery. Because the play portrays fears of miscegenation (the intermixing of races via marriage and/or sex), it's nearly impossible to talk about race in Othello without also discussing gender and sexuality.

Questions About Race

1. Which characters in the play make an issue of Othello's race? What kinds of stereotypes are at work in this play?
2. How does Othello's race affect his relationships to his wife and to other characters?
3. How does Othello's race play a role in the hero's self-identity?

http://www.shmoop.com/othello/race-theme.html

The study of Othello

http://absoluteshakespeare.com/guides/othello/othello.htm
This link is closely rellerant to the study of Othello. It involves the plot summary, commentary, characters, characters analysis and other essay that is related to this play. Please have a look if you are interested in it.