For me, it is personal preference. The women I have had, albeit I can count on one hand, have been older than me. The youngest was probably late-30's and the oldest was around 50 years old or so. The body type of the woman who I lost my full virginity was a white BBW in her late-40's. Her breasts were massive (42H's if I remember correctly). Thus, I am drawn to women with a similar build. Not that I wasn't beforehand, but it solidified it. They were also the next-door neighbor types. Some of my favs on here are SultrySerena, JustMe, Addie, SandyUK, CougarJules, Sinfully Sxy One, and Texas Elegance. You can see one or more of these characteristics in each, plus a few others not mentioned. Also, how descriptive and imaginative they are can seal the deal on subbing.
Most importantly, embrace who YOU are - what makes you personally happy. A big turn on for me is seeing a woman embrace herself and what she wants. It is conveyed in her body language and thus the photoset. Hope this helps, Cassandra.