I will try to give my thoughts on all the cover posted.
@kristynamaximova as others suggested, I would move the title in front of the characters (I didn't even noticed). I like the cover, I get the characters have a bit of rivalry between them.
@Flios mmm, I would put what I think is the main character (the one with the title) in the center and the others around him, like this cover for example
@faisalhussein394 I like the title style and the cover idea. I would scale down the font for the "drawn by" part, it doesn't give enough space to the title.
@Animefanka the first two Covers seems ok to me, in the third one I didn't notice the pink haired character, I thought it was background at first sight.