Optional pregnancy, not mandatory, or if it is, have it be at the very end of the game. It's a huge turn off for me personally.
Also a redneck asian girl would be great! Been to TX myself, and yeah SE TX has a ton of asian communities, most are in cities and speak more normal American urban (no accent either way other than standard) but you get a few in the country who get that southern drawwwwwl.
As talked about before in your other game thread, having the MC be a bit devious, I like playing as bad guys but I understand that's not everyone's cup of tea. But having the MC mislead or lie, gaslight/decieve/trick a few girls into sex would be great, or perhaps with threesome content, have a devious wing-woman. Set up a sexy encounter with a threesome, with the MC and the Wingwoman having the scenario planned out, but the 3rd girl thinking it was spontaneous and random, not realizing it was methodical to get into her pants. (Note that that's not non-con for those against that)
Love main Tomboy, gives me Misty from Pokemon vibes and that was my first crush! Short redhair, feminine but obvious boy interests are great. No tan lines please!
Sexy brown girls are great, but for me a brown girl with a random snow white tan lines are off putting.
And as others said, a bit serious is great. Haven't played too much of your other games, but taboo relationships are hotter whenever they're treated like it's actually taboo.
Areas of Gray does that very well.
Milfy City too, whilst a bit less serious than most games, at least has the MC be seen as weird for wanting to bang his family, and with the older sister she's very hesitant to embrace it. And when friends find out MC and younger sister and fucking they're freaked out at first too.
Love the renders!