There is no accounting for peoples taste. Always remember this.

I really dont know. I saw a green bot , just black skin with green stripes. It has 117 Views and much diamonds! The skin wasnt shaded or something. D:

it all depends on what the people really want, you make some good skins but the majority of them are female skins, and there are a lot more male MC players then female, (no offense, your skins are good but just not appealing to the average player) and it all depends on the theme, here is a tip: keep up with the popular themes and topics, make good skins about the topic [which i know you can :) and stick with it] and you will get that, also tags help... a lot haha

Dedication maybe?
I used to post a lot of stuff, that I made in 30 minutes before, they normally got 200 views or less, now I only put stuff that I worked on for days (sometimes weeks), this may define the level of quality your project, and it will definitly raise the popularity of your project, after I started spending more time in a project I got 3000 views in 2 days, and the project got to the popular page, but in the case of skining, I don't know why you don't have many views, probably because people like to stick to one skin for some time? You could try taking skin requests, I don't know, maybe it will work because skin requests often get you subscribers =P

tags, that's all I can say.