Reading through this whole thread, it seems like a problem with the images being denied is that they rely too much on the subjective taste of the moderators who approve/reject them, rather than them looking at the objective quality of the image itself.
It's fine if you personally don't like something, but that shouldn't cloud your judgement. Gotta remember you're not just approving it for yourself, so your subjective taste should play absolutely no part in it. If the objective quality of the image is good (and yes, art can have objective quality, as it would otherwise be impossible for one to improve their artistic skills if there was no objective measure of quality to improve), then there are those who are bound to like it.
It cannot be just up to the subjective taste of a fraction of a percentage of the userbase to decide for the rest of the users what they like.
Not saying the approval system by vote is bad. Just saying that things should be measured by an objective standard rather than a subjective one. "The image is boring" is a subjective assessment that should more accurately be worded "The images bored ME", and "Obviously no one liked it" more accurately translates to "Obviously none of the SMALL group of people we have vetting these images personally liked it". Neither of those would be proper standards of judging an image's actual objective quality.
Basically, if you don't like it, but can't find anything actually wrong with the image in itself (and it's not violating any ToS either), it shouldn't be denied simply based on your own personal feelings, because those don't matter. You're not approving the images for yourself. You're approving them for a MUCH larger group of people who have a wide variety of tastes and preferences. All that matters is the objective quality of the art.