I like the second shot it has a very good feel to it. Hard to say just what it is I like about it but it just seem to work for me. The isolation of the arm and the graceful downward position of the hand gives it a very natural and appealing look. If I were to make a suggestion it would be to try a thighter crop at least on the right side and perhaps a little from the top to bring it more in line the the rule of thirds. Very nice work.