well it looks a lot like him, but you've only spent half an hour on this... if you were trying to be very detailed and accurate, it would probably take almost double that time, at the least. do you use layers to help your lineart? if not, simply draw the outline, set the layer with that outline to abou 40-50% transparency, then make a new layer above that and begin going back over the lines. You can do this as many times as you want to slowly root out inconsistencies in the lines, then delete all but the last layer of lineart and begin to color on a layer below the lineart... Keep in mind that realism doesn't involve line art in the slightest.