If you're using it to learn how to skin, I'll take the time to make a constructive comment.
Look at your first one (all black). What's wrong with it?
It's just a solid color. By that I mean you basically used a paint bucket to fill it in. You need subtle variations in the color. Whether you choose to skin the high-lights of the curvature of the wing, or if you want to fade the black paint on the leading edge, and wear it away at the edges of the panels, or to scuff it up by the wing roots (major access points on that plane) you need to enhance the "solid fill" of black. Solid color with no variation = dull, boring, not "realistic". The eye notices the details even if you don't conciously take them all in. You have to add something for the eye to see.
The rest of the skins weren't serious so I'll not comment
EDIT: Read the sticky post by Skuzzy. It has a link that tells you how to put them in-game (offline only).
