The funny thing about this topic for the WC is how many of the posters didn't know what an anachronism was! They were confusing it with an incongruity (one 'anachronism' suggested was a deer in a grocery store). Man. I suddenly feel very, very smart.
Well, the idea of a steam-powered robot is not a product of the steampunk genre. Harry Harrison actually had a backwards planet with steam robots in one of the Stainless Steel Rat books.
This is not that particular robot however. The guy is based on a photo portrait of an ancestor of mine that sits next to my great-grandfather's pocket watches (these mechanical marvels are astounding. I'm saving up the $200 need to repair one of them. Interestingly, I live in rural Vermont, but there is a vintage watch repair place within walking distance of our house).
The piece took about 4.75 man-hours from sketch to posting. I'm not good with coloring; I have no real color sense (which probably explains my C+ in painting in art school and my subsequent foray into graphic design and typography). So, I colored it in full-color with lots of local color shadows and then "sepia-ed" it. The full-color one is here . This is the one I posted at the Weekly Challenge.
listening to while posting: Hungarian Rhapsody by Franz Liszt (not the Roger Rabbit version)