Very nice! =) This reminds me of when all I had to work with was paint and a mouse.
To echo what Scrabino said, you should try playing around with shading. Since MSpaint is such a simple program, shading is the best trick under your belt. It can take a long time, but you can never shade too much when it comes to Paint.
And yes, please post your work in just one thread, we'll find it there.
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