Hellooo!
Looks like you had really nice light, and you've used it well. That's the first C dealt with, now for the second:
The first one is very nice, the glittery background works very well - maybe clone out what could be some stage kit just under your dancer's legs and you're right there ...
Second one is a nice moment, could maybe be framed a fraction to the left to include all of the figure at the left of frame and again, you'd be there ...
Third one is nice.
Final image again could do with getting all of the right hand child in frame. Working with a prime can make framing tricky sometimes, especially where foot zoom isn't possible, but something to consider for the future - I see you're selling the lens used for these in search of a zoom, which would probably help with this issue.
Again, nice work and keep it up ...
Owain.