I like the middle one the best - what were they done with?
I'm using: sexy.ai's 'RealCartoon3d' and 'FantasyMix' models
The free level allows up to 768x768, 2 images at a time... but doesn't seem to have a limit on how many images you can create. There is a queue for some of the other models (they have like 20-30), but I really prefer the artsy/3d style of the two models I use.
Exercise caution with your prompt engineering though. It hasn't rejected any prompt I've given it. I'm guessing that it would just ignore keywords that were 'problematic', I dunno for sure though. It will lean hard towards rendering women and nsfw if you let it.
I fiddle with the 'steps' and prompt strength ('CFG scale'), there's not much else to customize.
Colors/terms do tend to bleed through, so if you want one thing green and nothing else, it'll be tricky to finesse the prompt to make it happen.
I'm pretty happy with the results though... for example Using RealCartoon3D and the prompt: a fully dressed handsome male Irish rogue, (skin:sunburned|shiny|[[freckled]]), (short hair:emerald|chartreuse) and a ((goatee

(green))|long|dark)), ((long detailed pointed ears)), (ultra detailed clothing:faded|brown|rough|woven), rustic sailing ship in the background, [smiling at the camera], ultra detailed, 8k uhd, close up headshot
(( )) = emphasize, [[ ]] = de-emphasize, term1|term2|term3 will blend/combine.