The last two sketches look interesting (second too).
Welcome and good luck !
thanks! im going to post more soon 
I like the second drawing on the left. And the one with the nozzle on head looks like he could go down the cyborg-alien route.
Really cool work I like the second drawing from the left as well. Love all the small details and repeating shapes. Maybe the design could benefit from some larger shapes as well? Good luck and have fun!
Now I'm doing some silhouettes thumbnails just to focus on the shape, cause doing only lineworks keeps me too much constrained on them.
@vdillustrator Yeah, that was the plan for that design I will make some thumbnails soon.
@oken Thanks what about now? unfortunately in most of them those details will be covered :\ I should have done the thumbnails before, but I had to sketch those ideas as soon as they popup in my mind, before forgetting them 
Second and third look really cool !
Although all are nice ! (but yep, the very last one not enough evil, 4th could still work, I think ?)
10 days later
Thanks!
yeah, maybe i could work on that later
The camouflage (last) one seems to be very interesting to play with.
thanks! I will work on it later
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!
