I like them all, that shoe design i played with myself on my 3D entry, amazed actually to see someone else come up with it. 
With yours though you thickened the plate on the bottom while mine was flat to the heel.
Just cool to see is all.
I like the 3rd one as well for simplicity sake, the far right shoe looks good also. Nice work, don't forget to add portfolio and info? if you want to anyway.
