Is it just me or do you use the same shading template for all your skins?

I suggest working on your colour choice. And if you like that type of shading, your pretty good at it.

As for feedback, try not to use the gradient, line-y style of shading if you can help it. It looks unrealistic and amateurish. Think about the shape of an actual body and try to shade the parts of your skin to mimic that shape (for example, arms are a long smooth cylinder with one crease in the middle, so it doesn't make sense to put a line of shading right near the shoulder). I actually made a blog about this a little while ago:http://www.planetminecraft.com/blog/how-not-to-shade-arms-and-legs/

This is pretty good, but the shading is a bit intense. Maybe try toning it down a little. Other than that, great job! *Diamond for you*