This is a modified piece of work. The base image is taken from concept art for the new Mechwarrior Online game: what I did was apply a new paint scheme to the Battlemech changing it from a Mercenary Spider to one from MWO player unit Blackburn's Raiders. I had a lot of fun with modifying this. I'm really hoping the game will allow this level of texture editing :d
Credit to Piranha Games for the original concept work.
Credit to flyingdebris for the original art.
NOTE: This particular Spider is part of Blackburn's Raiders training Command, and therefore wears a high-visibility colors scheme unique to trainers.