Im not a character artist myself, so i cant really crit you there. Everything looks solid and great :D. But for your website you should definately have a nav. Even thou you really only have a gallery and render images etc.. Your viewer should never have to use the browser back button. (or so my web dev proff taught me).
The concept/sculpts for me are a bit hard to read. The paint over stuff you are doing isn't flushed out enough and really is just distracting. You need to sharpen up some edge detail because you are not helping the forms at all. I would much rather see a grey zbrush render. Work looks pretty good, but that was my first…