Very fun way to go about this, really like the head effect the contrast with the otherwise very hard and pointy shell.
Number 9 on the second batch and number 10 on first.
Good luck choosing your own best colours !
thanks 
i'll take into consideration
Also 5 is nice too (for second batch) ^^
Moved to the second one
this time I used a different technique, it's more loose, but it's, at least for me, more appropriate for a more intricate design, and it lets me give some bit of shading sooner mantaining easy to add color palettes
@mr_dessin Sorry, I had to reject the camouflage variant 
With that cloack, in the final illustration, would make me hard time to find a good composition considering I have to explicitly show the superpower..better keep it simple!
Top from left to right
1,4,5,6, i like, 6 stood out more, then 5, 1, 4.
I like easy to pic number stuff and things just for future 
i was like how do i even!
oh sorry! I forgot to add the numbers! 
anyway thanks! yeah I like the 6 too
yeah, 6 is definetly the best! thanks
1, 2, 3, 6 and 7 are nice. I would say it will depends on the environment/lighting of your scenery.
Cool character design by the way!
10 days later
Hi guys!
I was working on some more thumbnails for the 3rd character, but it didn't convinced me so much so I rejected it, I post it just to show:
So, after moving back to the 2nd and refined a bit, I decided this is going to be my character!
I'll do some other views, then I'll move to the final illustration, oh and also I have to find a name
6 is very cool ^^
But all of them look interesting !
Happy new year to you as well !
Looks like your dude has been pushed and is falling. It's because you have made an inbetween, you depicted a moment just before he lands. If you keep the jumping action, the pose you want is the one on your fourth sketch. Otherwise you can tweek a bit your drawing and make him slide, like a football tackle.
@innocent thanks for the reply
I wanted to show how strong was the cannon by making him pushing away in the opposite side of the firing shot
I tried to work on the 4 too, but he was looking too much relaxed, like resting on a sofa.
Now with fresh mind I think I get where the mistake is, a perspective error on the legs, I'm trying to fix it, also I will try to tweak it as you adviced, thanks again
Here some progress, i fixed a bit of the left leg perspective, considering that's not the focal point It can be good that way, then I did the background, I prefer doing background first so I can setup better the character inside the enviroment.
I also made the flat color layers, now I'm moving to the shading part
