People are always drawn to critique great works of art, nobody wants to attack something of low quality. This piece is up there with Norman Rockwell in quality. Yes the subject matter is silly, (due to the contest I know, maybe post that in your comments) but silliness aside it meets and exceeds the theme of the contest. The textures and light refraction give me a clear understanding of what each material is made of. The shading is consistent giving me a clear sense of lighting direction, however It would be nice to see some more defined cast shadows from a more dynamic light source. The color balance is great, the shadows and highlights have defined temperatures. The anatomy and perspective is spot on, I couldn't spot any issues (and I look extra hard with high quality peices). As for the mechanical aspect, the shapes give me a good sense of three dimensional space and plausible movement of parts that look functional rather then decorative. The Christmas lights were a nice touch and good way to add a bit of color, I would recommend putting some cast light from them on the shinny parts. Overall the composition is pretty solid, you created a circular space in the top 2/3 which keeps my eyes on the image, which also placing your main subject matter in one of the golden thirds positions (top right line crossing). Overall this is a great piece, as a person who loves concepts I would have preferred to see more of the machine, but that would have meant sacrificing a dynamic composition so great decision. Keep this great stuff up.