#1 is definitely too saturated. the background is a little busy as well. i'm not sure where the skater's shadow is at on the ground... seems to be missing maybe??
#2 i think this one is the strongest of the bunch because of the composition. some better lighting would make this photo excellent.
#3 same as #2 really... good composition but the lighting isn't as great as it could be.
#4 doesn't seem focused on the skater. the lighting is good here, except it looks like your flash fired and it would look better with the flash off... which may require a reflector so that his face isn't dark. the background is too busy here.
#5 pretty much the same as #4 except the focus seems better. i like the focal length on this one
#6 also like the focal length used here. again this would be stronger if the lighting were better and the background less distracting.
sorry if i sounded too harsh, i don't mean to! i think you are off to a great start. this is a subject i haven't seen a whole lot of, so it's very interesting

you did a great job with "freezing" the skaters in motion. i wouldn't be sure how to get a less distracting background in this type of situation... it's not an easy thing to do, i'm sure! i would suggest studying off-camera flash for this type of photography. i think it will really help with the lighting in your night shots. good job, keep it up!!
