Keops, you did a really nice job on the portrait, good color selection, shading, etc. The fighter sprite has very nice folds on his pants, and also a good color selection... though I noticed a few problems elsewhere:
-his > leg appears thinner than his < leg (the foot is fine I think)
-the head appears rather square (the jaw in the portrait appears more angular)
-his < hand also appears blurry, perhaps removing the brightest tone and/or place a shadow on the backside (< side) of the hand should correct it
-the < glass should be slightly darker since his face is turned a bit
-you *might* consider shading the coat the same way you shaded the pants (an distinct division between light and shadow) unless of course you wanted his torso to have a flat look, which I suppose is fine