I think there's another thread for feedback on covers, in fact there was a really good one a couple of months ago with a graphic designer, so I mostly made this one for giving people feedback on banners specifically, since there'd just been a banner contest and I have a banner Tapas have actually used. I don't really mind if there aren't more submissions to the thread. I'm happy for it to sink into obscurity if it's served its purpose!
I don't really do feedback on KDP covers and the like, because.. .er... I've never published anything there? Different sites and platforms have different expectations and fashions for covers. I'd recommend getting advice from people who have done well on the platform you're aiming for, or researching what popular covers in your genre look like on there. I can tell somebody how to make assets that will work well for Tapas because I have a modestly successful comic on Tapas that the staff have featured multiple times and even put on a contract, and I'm very familiar with the platform having researched it a lot. KDP, not so much!