It kinda looks like some kind of cat person, I am always looking for manimale cat people art that looks real, not Anthro, and this is really good, I love the way you were able to make it really look like he's moving, not only with the back grown, but also with the dirt coming off his feet, very cool!
Not to be inspired by existing animals is not so easy Randis! Anyway, i love the energy it's not just a stupid monster posing...He's alive! It's the more positiv aspect of your picture! The speed effect is perfect! Good luck!
Actually, this may be the closest I've seen to a creature which probably resembles early humans. People developed massive running skills very early on, and although they were not the fastest runners, their endurance ensured that in the end, they caught their prey.