Aye, some really nice studies you got here, i can see much improvement in comparison with your first few studies in this sketchblog (:
As for your latest illustration, The painting so far looks really good!
I think revising the composition again will make the piece stronger. What I now notice is that both Snilk and his companion are both trying to 'compete' to get my attention; the canvas is torn in two basically because Snilk is on one side and his companion on the other.
The most 'desirable' is to have a ratio with thirds (=golden ratio), as it's one of the easiest but complex composition principle to implement in art. Overall, the piece feels a bit flat, lacking a feeling of depth.
I think you can get away with some extreme foreshortening in this one, that way you also force depth and dynamics in your piece. I added some examples from League of Legends splash-arts to give you inspiration:
Project Katarina
Blood Moon Talon
Heartseeker Lucian
Just my two cents, you can decide for yourself what you want to do with it [: