Mech concept art

Hello! I have a project underway that requires some concept art, and I'd like to also do at least one environmental image for a pitch to my partners. The project the art is for is a pen and paper game. The players are pilots of remotely controlled robots. Emphasis is on robot vs robot combat, obtaining new parts for the robots, obtaining new bot chassis, and progression in pilot abilities. I need concept art for at least two robots. One tall, lithe, and sharp, long legs and arms, very narrow torso, with emphasis on its graceful articulation. The next is for a stockier bot with roughly human proportions but wider shoulders and heavy armor. Obviously shoddier construction than the one before it. One arm looks to have been scavenged from another bot. First set piece is of a messy workroom where bots are being constructed. Parts strewn around like an old-school car mechanics shop. Bins of old parts along the walls, the bots themselves in bays on an adjacent wall. Two images in different styles are attached for a general visual guide, but other styles are acceptable. If initial product comes out well, we have budget for about 50 images to populate the initial play guide.