Wow, really nice thumbnails. In all of them, you've manages to show a good chunk of all three sides of your character, which seems like it wouldn't be easy. Nice work!
As for the designs you posted, my only comment would be to avoid some of the more complicated headpeices. You've got enough work just conveying all three sides clearly without making intricate helms that make them harder to read. I would think that simpler, more distinct shapes would help the peice's clarity more.
Good luck whichever you choose! 
Thank you. 
Its hard to stop myself from complicated decisions:) but I will try to simplify some things
I don't know why but the second image is calling me ^^ (the one with red sky)
But probably because of the fun Green / red contrast.
That is a very cool idea having three fighters in one "person". You've done some nice, dynamic poses for your champion. I suppose these colored sketches are compositions for the illustration? Looking good! c:
Yes, I'm looking for a color solution for the illustration.
Thank you.
I like the middle one's background and the green fire from the last one.
nice work so far
It could work if you put a mirror or some type of reflective surface somewhere in the final composition that would show any of the characters that get hidden.
I like how you solving the composition and character design. I like most the composition you choose at the end. It's pretty dynamic and every character supports each other, good job. Only one suggestion, I have the feeling the character need more space to breath at the top. With the less space you stop the dynamic momentum of the swinging speer.
Thank you. Now i feel it too)
i like the mid one, the oranges palette works really nice with the pale violets, the green variants are too much aggressive imho, personally i would try to implement the bkg to add a lighting element, if the cauldron is your main light you have to figure out better the shadows it will cast, but if its your secondary (if it is like a fire or a lamp the decay of the rays can make it more like a glow) you can have maybe a direct ray to shape your character the way you feel better
Thank you. I also like combination of color in violet variant and its in general look interesting for me but in green one beter focus on character comper to violet. I cant say that i 100% with green variant, so it can change on the way to final. Cauldron fire is secondary light.
The green and violet go great together, great choice!
