I don't care for the yellow/greenish background. otherwise well done, good composition, funny twist with the pressed down strings that break up the otherwise parallel lines that dominate the diagonals.
I wouldn't choose to draw too much attention to these particular fingernails. Focus isn't particularly sharp and the dof isn't shallow enough to make this composition work. Too much glare/reflection off the guitar body. I don't get much of a sense of this being 'live', I think more context is needed.