It's an excellent render. But... with her legs crossed like that pussy shouldn't be so exposed/opened. What i want to say is illustrated under the spoiler. Pics I posted are free and I found them just two hours ago.
The further away from the camera the models are, the lower this can go. It's how video games do it. They will have low poly models for when they are off in the distance and higher poly for close up as you simply can't see the detail at a distance. Try some test renders with varying levels of subdiv at a distance.
