Heads are both from Batista wrestling figures or shrink casts.
Torso/arms: MU Drax
Legs: G.I. Joe (uncertain of source) heavily modified and sculpted.
My Guardians project has been pretty slow moving since round one, but I have the core team from the first movie essentially put together. Not every figure is screen accurate. Groot, for example, gets a comic mash up version, and Gamora has an alternate head that I prefer which does not look like the actress. But overall, I think they each capture the character and the group feel.
Drax might be the closest likeness beyond Star-Lord. At least to the extent that the hand-drawn tattoos allow that to be true. They are far from screen accurate, yet also far, far, closer than I expected to be able to manage.