These are absolutely stunning! You could totally turn all these into prints and postcards when you are done!
So far my favorite is the night scene. I love the dreamy romantic mood and the color scheme especially. If there is nothing else you can find to do, usually that means the piece is done. We can get into the bad habit of overworking a piece. However, if you take a day or two to not look at it, you usually can see what was bothering you.
I did a slight paint over to the things I saw and what I may have done differently.
The focal point is the couple sitting there. Usually when we overlap objects, it adds depth. However, the one firefly I think makes the girl less readable so I moved him off slightly. It helps if the space around them is clear.
I squinted my eyes and this helps me figure out what reads clear or what needs to be defined a bit more.
I hope this helps! Keep up the beautiful work!!