I had a go at drawing Pyro without using any references. I forgot about a few things, like the gas tank on his back and its straps. Also, the grenade belt is mirrored. And I think the Axtinguisher has bigger blades than that, but I didn't want to erase all that. Feedback's welcome.
That Soldier is decent enough. As Oddey said, the helmet should be more round, the edges shouldn't stick to his head this much. Otherwise, good job.