Üdvözlet a PixelJoint-on!
Nice first piece. Looks good zoomed out - though his left eye seems a bit weird. An interesting dithering technique you have, but it seems you missed to finish a part of green under the mirror. When zoomed in, the outlines look a bit jaggy, I suggest you get rid of them or try to blend them in. Personally I would get rid of the flat surfaces too (shade the yello wall and the clothes). But again, great pixels overall!
What photo did you used?