Current Rating: 3
Your skins are extremely simple and have no shading whatsoever. They are very basic and most of the time people won't use one-tone skins.
That being said you still have much time to improve. You're just starting out so this is alright, but once you feel comfortable stepping up to the next level in skinning, try adding shade to your skins. Even if it's only using a noise filter, anything helps. Once you really feel like you are ready to skin like a pro, try using a style of some of the best skinners on PMC or develop your own.
Remember, this is CONSTRUCTIVE critiscm, I did not mean any of this in a mean way.
Wish you luck on Planet Minecraft!