[WHISTLES] Neat! I'm not sure if I like the concept or the ridiculous amount of detail on Jazz more... XD
Though, I have to agree with this Straya person... As a rule, I've observed that women tend to go deadpan when robots enter the conversation. Except for a handful of exceptions, most girls seem to not like anything that doesn't have guys that look like girls or features any form of technology whatsoever... :\ Hell, everytime my wife rolls her eyes at GaoGaiGar or Gurren Lagann, I die a little inside... ;_;
That's excellent work. You've captured Jazz's personality very well. Your style certainly makes him look lively without making him look skinny, as many cartoon artists have. Perhaps you could stand to practice drawing robot joints so they looked more realistic, but that might have bogged you down from having too much fun. As for the humans, you drew them well.