First off, this is a fun cover from Cory Walker. There's a lot going one but it's got great depth and priorities. The main characters stand out against the background, allowing you to discover the detail in the background as a secondary note. The way it should be. The atmospheric perspective helps out by lightening the BG as the elements gets farther away. It's the way to do it people, take note.
Massimo Carnevale is so good it makes my teeth hurt. It's a simple design, main character standing front and center. But if drawn/painted well, like this one, it can be quite fantastic. Win!
Another example of this. Why do I like it? The color. Green against red is a personal favorite. Maybe because I was always told NOT to do that in art school. What do they know? Most teach because they can't get work as an artist.
I guess I'm on a green and red roll. This design is simple yet effective. I bet it jumped off the stands next to some of those rainbow covers that seem to overwhelm the racks. And it's well drawn. Mr Chiang knows his shit.
And finally, this one. I'm a sucker for comic book cover design that feels like a regular book design. Great job.