Why cant i upload a photo

This is what the site says about uploading a new photo. First, make sure you're not violating any of these conditions, or you can upload it, and/or it won't be approved:

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Add a new photo

Photo Guidelines
No suggestive photos, nudity, or obscene gestures
No disturbing images or images of illegal activities
No copyrighted material
You should be in all photos
Photos should be in .gif, .jpg, or .bmp format
Make sure the filesize of the photo is not too large or it will not upload properly

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A "too large" photo, as near as I can tell, is larger than 450x450 pixels, but that may just be a wild guess, because the size of my pictures varies widely.