Shoe/Sneaker in perspective

I was exploring a technique for shoe sketching. (I understand that Shoe designing is a different level : )
A perspective sketch of the shoe is a challenging. After digging it for a while, I opted for this early method.

Thanks … for info ( Yo,R…) various posts,blogs. I have also used few sneaker photos to mark the probable position of imp.pts.
I welcome any comments & suggestions…

Looks great, how are you drawing them? Digital?

Wacom Intuos3 + Sketchbook Pro6 .
Someday, I will share a video from my desk. :smiley:

Sorry, obviously its digital. Dumb question. Great sketches!