Firstly, I wouldn't post my skins on The Skindex. While it is a decent skin editor, people on there can easily write your skins off as their own. I use the Skindex to make skins myself since it's free and better than some skin editors elsewhere, but I have seen great artists torn down by beginners stealing their hard work and talent.

For you, I reccomend looking at some shading tutorials. They can range from shading skin or hair to how to give your skins ombre effects. These helped to kickstart me, so maybe they'll help you too. Keep in mind as well that as you practice, you'll get better, take my word for it.

As for creative names for skins, don't force it. None of the skins I've ever posted have had ultra-unique names.

Sorry for throwing a wall of text at you, and sorry if none of this helps.