Well firstly your art skills and general mannerisms remind me of an age range that shouldn't be on this site (that or your art teacher was Caliborn).
But to delete stuff, there's a handy little box on the top left of every post. You just click it on your own posts and then go to the bottom right of the page where it says "delete" and click submit.
Perhaps spending a little time getting to know how image boards work would save you and others a lot of trouble. Also practice hella hard before you try to submit art for the world. Get your mom to purchase some reference books so you can work on anatomy poses.