Hey, sorry for the late request but could you try to get the legs closer to the body and make the head bigger to make the dragoon appear a bit more compact and less spider-like? Something like this maybe:
With regards to the claws, I'm still not sure how they would slash without interfering with the head and legs. They could attach higher on the torso and go above the head and its mandibles but I'm not sure whether this would look good. Maybe you can think of something.
Torso/leg proportions are the same as on your last shot? The torso and head still appear a bit small compared to the legs. I guess the claws are fine, though you might want to make them less round and more spikey if they attack like this (like the Marauder's).
To be honest something still feels odd about the limbs. On your concept #1, it looked more like a big and scary alien that could jump at you. My advice that the upper tips of the legs should go above the torso like on the Marauder was probably wrong.
It's hard to tell the difference from the frontal shot because of how the legs aren't aligned in a row anymore. I think in general I'd love the model to be more like your concept #1. I feel torso and head should be much more dominant than they are now. In particular I think my advice to make the tips of the legs exceed the torso in height was wrong.