About animation with other's models

Hello there. I'm very recently here (just registred). Because i need help with critique my animation and of course - improving my skill, but there's one thing - animation is mine for 100%, but models and their textures... Well, not mine, i'm not modeller at all, all i can do is just do little redactions to existing works, but that's not a big deal. I take models from different games and doin' custom first-person animations with them, and put them as addon into Garry's Mod (well, at least it's easiest way to show my works to wide public but YouTube). 
So, the question is - can i post my works here for critique, taking into account that almost all models and some sounds are not mine?