Robot - Concept Artwork

I based the design of my robot on 'Rocket Metal Sonic', 'Dinosaur Zoid', and a Sentinel from 'The Matrix.' After looking at some serious weaponry, I decided on a good old reliable Gatling-Gun. Below are the visual aides I used to come up with, what I consider to be a 'Retro' concept.

Research

Research - Robot/Weaponry - Image Websites

Cubix: 
http://www.figures.com/databases/action.cgi?setup_file=fignews2.setup&category=actionfigures&topic=56&show_article=57

Rocket Metal Sonic: 
http://ssn.sonicstadium.org/update/artwatch-e-122-psi

Zoids:
http://www.expandsearchanswers.com/jump2/?affiliate=zirong959&subid=49703&terms=fast%20foods%20-%20take%20out

Slizer Robot: 
http://www.brickset.com/search/?subtheme=Slizer

Star Wars Robot: 
http://jmidgetou.blogspot.com/2009/12/my-top-15-robots.html

Toy Dinosaur Robot: 
http://www.sourcingmap.com/children-toy-dinosaur-robot-red

Robot Dog Toy: 
http://www.child-toys-guide.com/robot-toys

Matrix Robot: 
http://kehlan.deviantart.com/art/Matrix-Sentinel-23107485

Cute Robot: 
http://www.hongkiat.com/blog/adobe-illustrator-cartoon-tutorials-best-of/

Robot Parts

Research - Robot Parts - Image Websites

Tank: 

http://www.militarypictures.info/armour/Arjun_tank.jpg.html

Bullets: 

http://www.dillonaero.com/content/p/9/catid/0/pid/33/?viewImg=1&pimg=accessories/dummy_ammunition.jpg

Gatling gun: 

http://mdmetric.com/prod/rfn/Springs%202.htm

Jet Pack: 

http://mozillalinks.org/2009/05/new-ways-to-extend-firefox-with-mozilla-labs

Claw: 

http://parentingbookbybook.blogspot.com/2010/11/week-21-book-21-raising

Metal Spring: 

http://www.bazz-houston.com/compression_springs.html

Gatling gun: 

http://www.techeblog.com/index.php/tech-gadget/feature-cg-animation-

Rocket: 

http://www.questaerospace.com/items.asp?Cc=SKILL2&iTpStatus=1&Tp=

More Rockets: 
http://www.rocketroberts.com/rockets/rockets.htm

Robot Research JPEG

Initial Concept:

Initial Sketch

Final Concept