As Amp said they are a bit dark. I think the head fills the frame a bit much in the first one, pull back and let the character out! I was photographing a boxer yesterday for the first time, here is an example....
I've had a go at the second one, hope you don't mind. I adjusted levels, a bit of Shadow/Highlight work, gave it a colour boost to bring out the browns, cropped some floor off and sharpened.