I just finished making my MOC of Dwarf Gekko from MGS4, and I tried making it as accurate as possible, but I'm happy with how it came out. If you guys would like to build one of your own, head on over to my account on this link: https://rebrickable.com/users/Leg0Gear/
God, how much I love Yuji Shinkawa's style of designing mechs. The concept arts are in the manuals
Here are both the renders for the Sphinx and Medusa used for acrylic stands from a contest by Capcom. They also had acrylic stands of The Griffin, Cyclops, Chimera, and Grigori. The website doesn't seem to be working for me, but if you guys would like to give it a try, here is the link: https://capcom-capkujionline.com/lp/dragonsdogma/