It’s not that it’s dark, or negative vs positive. As humans we’re strongly attuned to the subtleties of human faces. When an AI image is a bit off on a piece of architecture we won’t notice, but when it’s off on a face it looks creepy and wrong.
There are lots of beautiful AI images out there, but they don’t have faces in them; they’re scenic or architectural or design-oriented (someone in Midjourney has been making a whole lot of textures, perhaps for a game?). On that scale the AI quirks can look charming & artistic.
It’s easy to ask for pretty pictures. Me, I like really fucked up things, so I guide the AI in that direction. It’s just a matter of taste.
I’m using it for free. Just one 600 iteration picture (4 points) and one upscale (1 point) per day.
If it comes to paying money, Midjourney is the clear winner. Cheaper, and the quality is much higher. Plus anyone can apply for the beta, you get at least a couple dozen pictures for free.