This woman right here, Alejandra Guilmant, has the ideal body shape for my taste:

Slender with large breasts and a round medium ass are ideal. ("How original! Daring today, aren't we?")

That being said, I feel like I'm capable of appreciate a super vast range of body types. Which potentially poses problems for monogamy down the line. I'm only into women.

Pear shaped women are also very attractive to me, for instance.

Being open to many body types allows you to be more governed by beauty and fashion, so i guess that's what "turns me on" (i.e what I notice) about people in the wild. As long as you have a healthy body (which includes some "overweight" people) you can make your figure look good by dressing in a way that compliments it.

Also, little cues and behaviour. Loud mouthed people who seem to be ignoring you/don't see you as a mate are a turn off.

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I'd also like to mention that I very much like mom bods, like you mentioned. Probably spent as much time lusting over adult women in my teenage years as i did lusting over people my own age, and that attraction to "milfs" is still there today. Seeing a woman taking care of kids is attractive, weirdly. Sometimes even a turn-on. But i think that's more about "proof of parental capabilities" than "oh she's a milf, me likey"