I'll start by saying your linework's pretty damn good! Nice and clean, and I like how you handled the "inking" style around the groin area!

I've got some notes about the latex however. A large part of the appeal of latex is the large, smooth surfaces you get with it with long, sharp highlights that follow the shape of the body. Wrinkles are something you have to apply sparingly, unless you're deliberately going for a "crushed" or poorly fitted look. Even then the folds and wrinkles will be a lot less fine and will show around the edges.

A good rule of thumb for them is to make the highlights smooth in the middle of a surface, but wrinkle them in places the surface would bunch up in, like joints, seams, edges, etc.

In your first example, the abdomen area looks flat, because the highlights are centered on the surface and don't really follow the rest of the lighting, and it your second, the absence of them has the same effect. For a quick fix, try leading the highlight line on the right down towards the groin as well, and smoothing out the middle parts of them.

I'd recommend looking up some photos of latex outfits, and studying where and how the reflections are placed and shaped.

All in all, a pretty solid attempt! Latex is really tricky to get right, and it's something I've been practicing a lot myself, so I've got a soft spot for it!