Good question!
On twitter you can post anything (seriously ANYTHING) you like, but you should mark your account (in the description, e.g. "male webcam model, 18+ only") and pictures as adult content (in your profile settings / Account / Content: "Mark media I tweet as containing material that may be sensitive"), so people get a friendly warning and pictures get blocked for some people.
In any case, you should be aware that you can use your bio page on Flirt for many teasing pictures to get people interested in you. Anything you put on twitter can mobilize your fans when tweeting you're online right now and adding a teaser of yourself

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The next question would be: What photos do people like to see on twitter?
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