Photo is too busy in the background. Need to isolate the main subject more by using a shallower depth of field to blurr the background or rearranging the composition.
nice composition, I like blur on his hand, it showing some moving. nice colors. but people in the back looks like they are not there because they look to the totally different side. = 6
I like the main subject and the composition as well as the hustle bustle behind him, though, for me, I think it would work better using a wide aperture to throw the people and background behind out of focus.
To me, candid shot don't really appeal to me as stunning magazine cover shots. Don't get me wrong, this is a well done photo. It just seems to belong inside the magazine along with the article maybe about this musical group or person.
This is a busy scene... but that could say something about London. I might have moved more to the left so that you didn't have the guy on the left side in black in the photo... having just half of him is sort of distracting.. I might have used a different DOF so that the background was blurry.