As others said, a nice job for a first render. So, a little constructive criticism, since that's what I'm assuming you're looking for. (I'm far from the world's expert, but I've learned a few things, so...)
First, your lighting is a little flat. Normally, you're going to want the lighting to help emphasize the figure to which you want the reader's (watcher?) attention drawn. Here, the background wall is quite bright - appears it's lit by lights from the ceiling. Nothing wrong with that. Your figure, however, doesn't have any direct lighting to make her "pop" out of the background. What you might try is adding one or two spotlights, positioned off to the right and left of the camera, directed at her. That'll help her stand out a bit more. Google a bit for "three point lighting" - it's a common technique. You may not have room in the scene for the rim light (unless you use a ghost light), but adding at least a key light will, I think, make a big difference. (Lighting is HARD, btw - don't take this as a ding against your efforts. But it can make or break a scene, as photographers and filmmakers have long since discovered.)
In addition, while the body poses are pretty good, the face and head of the figure has kind of the "zombie stare" - looking dead straight into the camera. You'll get a significantly more human look if you twist and tilt the head slightly and then re-adjust the eyes to point back at the camera. It's rare for people to actually look dead straight ahead. The twist or tilt or twist+tilt doesn't have to be much - it's amazing what just a small amount will do.
You might want to consider sinking her knees into the bed just a smidge. That will probably require adjusting the knee bend just a bit so that her feet aren't then too deeply into the bed.
Finally, on your second shot - if she's "covering herself in surprise," her hands are likely to be more tightened up. Her left hand is more likely to be either cupping her breast, or at least bent in around it, and the right hand is likely to have the fingers more tightly together. Everything except the hands suggests tension, but the hands appear relatively relaxed. (Of course, you could be in a situation where she's relaxing slightly after the moment of tension, but in that case the left arm would probably not be so tightly against her body.)
As I said, very nice job for someone who's just getting started. Please don't think I'm trying to tear you to shreds - all of this is stuff I either discovered the hard way, or learned from others who were kind enough to coach me. Just trying to pass it along.
Happy to keep discussing this kind of thing with you if you like.
P.S., if you REALLY wanted to get advanced, you'd add D-formers to the top of the bed so that her knees would have the appearance of compressing the covers somewhat. But that's like Lesson 37 - right now we're on Lesson 3 or 4. (You're clearly well past #1 and #2... LOL)