Those black outlines/inlines everywhere aren't very sexy. You got your lightsource allright but you could pimp your colours more: Build colour-ramps that go from complementary colour to complementary colour. For the skin that would mean yellowish-green for the lighted parts and a reddish/brown for the shadows. Yrllowishc because your light-source is yellow kind-of. The trick to have it look good is the saturation of the colours here. They shouldn't clash too brutally. Since he's carrying a latern very close you could make the shadows deeper and more dramatic. That's c+c from me - hope it helped.