what's with the Colossal Titan ? Eren is main dude, his Titan form is badass and cool, same like Armored Titan, these two are badass dudes, wont spoil anything who is "Armored Titan" to those who don't know, but he is some badass guy too, Colossal Titan doesn't look that much badass, but you can try to draw him, cause in main anime his head is small, arms skinny compared to other body parts, legs are so huge that it looks ridiculous compared to other parts.
My point is...there are too many drawing of Colossal Titan that makes me think "are there really any real fan or something ?" cause i hear so many people loving this anime, yet, draws weak pictures and not so cool ones, c'mon, make wallpapers with individual well known Titan, the popular ones, make them look awesome, for example - Armored Titan, the place where he prepared to run for the wall, the stance, something like that, or draw him that he wants to punch the screen, and add effect that he just spawned and does it from smoke, like the scene with Colossal Titan when he spawned out from smoke, and the effect that smoke is like...coming from him, but it isn't, it's like stuck to him while smoke disappears, just like here, in this picture we can see it on his head. But picture totally is good looking, just saying...try better, try to be first do make awesome wallpapers on 1080p screen or simply in great quality.