Your skins look really good. Maybe a little more shading on the clothes and a few more outfits. :)

Improve palettes. Even with more simplistic shading, skins look fabulous with the right colours. Once you have that down, you can easily go back and work on different shading styles. Or you could work on both at the same time. You can always get inspiration for a shading style from another skinner and make up your own style.

Overall, all of these factors will grow and improve with practice. Don't force yourself to be creative but let it come with time and practice. The more you do it, the better you become. Nothing will happen overnight if you don't work for it.

I hope this helps!

I think it just needs better shading. Also, use a brighter/bolder pallete like in your 3 latest skins. It looks the best that way.

Nothing!!!! They are AMAZING!!!! Compared to my skins...

Try base skins off of blocks and things, not just characters

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Creativity.
I know there are huge limits to creating skins, but most of your skins has already gotten something so familiar that it doesn't really stand out. Try putting more random ideas into it, and don't be afraid to try out a new style of making skins. You already have the basic's, no questions there, but it would be a lot more fun to see a more creative side to your talent! :D

*has to go to profile because forgot what they look like*