Nicely done, but I agree with Eric in that the shadows need more contrast. Part of that is because it's difficult to discern the specific light direction. For the most part it seems to be washing down from above and front but certain areas that should be in shadow are not (the upper under the hat brims and the area under the left figure arm for example). Other parts - cannonball, left figure leg wrap, and right figure shako - indicate above left front; while the drumhead and bare knee seem to indicate above right front. Still trying to get this right myself, so I tend to look for it...
Cheers,
Glen