Just the other day I was talking to a friend who does python scripting & suggested the same thing.  I'd love to have a script/plugin that would allow for 3d painting right inside Poser.  I think this would be a great tool for Poser users, but it would not be easy to accomplish.

The others have given you some good advice.  I'd like too add though that Google is your friend.  You can find anything on Google if you can think of various ways to mix your keywords.  If one set of keywords don't get the results you want, try something different.  There are tons of information on the subject.  Do your homework, shop around, test some products in your price range (most have demos), and then decide what works best for you.

Have a creative day!

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My Lil' Store