Im gonna say these are the greatest photos ive ever seen just because your a Man Untd fan "come on the reds" lol on a more serious note I think the B&W tones are a little flat and the fur to the left of the image is a little washed out (over exposed) but a good effort considering your still new to your software. Try using the dodge and burn tool. select a soft edge brush and set it to say size 500-800, in the drop down menu select midtones and set it to 5% and sweep the brush accross the whole image. Then change from midtones to shadows and reapeat. Play about with the process and see what kind of results you can come up with. Hope that helps.