if you're not looking for crits or feedback go to the bottom of this post, otherwise read on:
pretty good amount of work so far, however to me they feel 'overly textured'
try working on your main forms and line more first to establish the content. you're rendering a lot but much of it feels like it is getting lost. try implementing points of interest/focal points in each composition.
that being said, try to put more thought into the actual composition itself as well.
the coloring itself also feels somewhat flat, despite all the rendering. try to learn more about color in general and how it works in the world. a blatant example would be the predator piece you have.. the armor is not being affected by the environment around it whatsoever. same with the warrior guy. in fact, I don't think there's any lighting in that one. establish a light source and stick to it.
I cannot recommend enough watching Practical Light and Color by Jeremy Vickery.
keep it up. I'm interesting in seeing how you progress.
overall, pretty sweet dude.