I think this has become my favorite Mando of the ones you've done recently (and he's not even finished yet)!
I love the helmet variation and the Cap'n America boots add nicely to this guy's infantry look; I recently used the same boot over a pair of Count Dooku SA legs and they really do like nice.
I support the use of a bit of yellow on this guy, whether it's stripes or just a patch of shoulder armor, but the color isn't one that used often and the tans/greens could benefit from a splash of color...