Hey man, a few paint overs here that will hopefully help you out.
With regards to the pilot and the Mei paintings, you need to open your poses more and think about negative space. If your silhouettes are not easily readable then your posing becomes less effective. If you want a dynamic pose then you're going to have to take your silhouettes further away from a box shape. For Mei's a good way to push the pose even more would be to pull back her arm on our right hand side so there is more of a gap between her body and the arm itself.
Here's what I did to the pilot piece to make the pose a little more dynamic:
It's not the only pose you could have gone with, but it gets the point across that he's falling and his arms are being pushed back by wind resistance. However, whether or not someone would realistically fall out of a plane with their arms and legs spread out exactly like that is irrelevant anyway. Even if we wanted to paint something in a super realistic style, as artists we're still looking for ways to make our illustrations look more appealing. Sometimes what we see in real life isn't the most exciting view it could be, so always make sure to think about that design aspect too!
So one issue I'm seeing with your paintings is that they feel unfinished. Either you're rushing to get things done or you're unsure of how you can finish, or possibly a combination of the two.
You did a good job of adding subtle textures to Genji, but you're really missing out on some hard edges. Especially on metal you have a good opportunity to add in some nice hard edge lights that will really create better depth to your paintings. I got rid of the rim lighting as it didn't seem to add much and instead opted to add in his bandana tail since it essentially does the same job the rim lighting was supposed to but better.
You also have some tangent issues in your works. Try to overlap more whenever possible when you want something to not look flat.
Hope that helps. Try to spend a little more time with polish on your work and I think you'll like the results. I know there can be an anxiety about having a good chunk of prints to show off to get customers in, but one or two really well executed prints should be enough. If people like the concept and it's executed well, you'll be fine.