Question Zulu, is that all your work or did you start from templates? I mean no disrespect, but some people re-color templates and consider it all their own work. I'm not saying you did or anything, but just asking. It's hard to give advice until I know the extent on what I'm advising.
If that is all yours it looks pretty good, nice strong details.
I do agree with Serval about the strong panels. The Spit looks more subtle but it's hard to tell without a closeup. It looks like you've got a good hold on the technical part of skinning