When you see a page with some pictures you have uploaded, on the right, there is an empty square. Check it. Then, at the bottom there should be a "Delete Selected" button. Try to delete some of your older pictures, to make room for more. Even though I am not aware of a limit for the total attachment size and verified that right now. So either you are doing something wrong when uploading the picture, or this is a generic vBulletin limit, which can not be altered.
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