The blue box with the image extensions looks kinda weird. I think the stuff under the top line is a little far to the right (in firefox). You might want to put the browse box closer to the upload button (which should be called "yupload image..."). The whole site might actually work better in a larger box to contain everything. It looks kinda disjointed. Hope this helps!
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I wouldn't change your site..Simplicity done with taste is my review of your site.. Sometimes people can so overload their site that it turns the visitors away..Nice job..