Yes, leg length is too short.
Strange. The more I like the first anim, the more I think it's not that bad.
I think the 3rd is OK (It's definitely close to Mary casual walk, I would imagine), but seems a bit """stiff""" compared to 1st. (2nd is definitely not the one to keep I think)
(Not sure of the word to use...)
If I was able to use this software I would just use the 1st one and edit a bit the limbs/bones animation to go in the "direction" of 3rd anim.
Hard to explain for me in english.