The first one is nice, but I'd like to see the colors be more saturated and really pop.
The second one is easily the worst one here, there's really nothing I like in it honestly.
The third is overall good, but I don't really like how the right side looks. Just too much going on.
Not bad with the fourth, but the brushes and the bright white light are unnecessary. Also, the outline around the one character is a little bad too.