Looks like you need some color correction, get rid of that pink hue, and all of them seem to lean to the left. All of this could be fixed in post. You can crop them to help with composition but I would be concerned with how much of the subject you would cut out in doing so.... What I started doing in situations I wasn't completely comfortable with, shoot wide. Give yourself room to crop and straighten the composition. As you get better you wont need to do that. But if you cut off a head or shoot to close, you cant add to the shot. You can only crop away unneeded space.