im sorry but it needs work..
theres too much black outlining on the tail..
u seem to have three different light sources hitting it..
theres over 30 colours used on it.. shouldnt have more than 16 (including the background)
it needs a darker shade of brown.. the shading just insnt dark enough.. use that darker shade as an outline on the head aswell.. the one thats there is too light..
sorry, you did well.. but it needs somemore time put on it..