I'd love to see more feet and soles ... I know it's a niche thing but it's one of the most common fetishes and statistically more men ought to be into feet than armpits for example. It wouldn't hurt that if the girl is laying on her back legs up in the air anyways to keep the soles in front of the camera (not on the far left or right, or outright out of the picture, which is always a bit disappointing).
A big one in my opinion especially for passthrough (AI or otherwise) e.g. in reverse cowgirl ... could we not have the guys hands or a blanket or what not covering her soles? I think many premium users enjoy women from head to toe and this would help. Thank you.
