Hey, sometimes cute and simple is all a cover really needs! It sets the tone for the story itself and that's all that matters! It's fine to be a little lazy btw. I more or less have a similar attitude when I make novel covers.
It's so much harder than making comic covers since comics are so much more of a visual medium and you know what everything looks like, but for novels it's all in your head. And for me especially, I'm not good at detailed character descriptions, so for my covers (unless I have a really clear vision of what a character looks like) I just try to create a vibe. It feels rushed and boring tho, so I usually end up drawing the characters anyway... Idk, I guess this is why comics are a better medium for me
Sorry I talked so much about myself, your cover is great 