An interesting and imaginative exercise of the abstract..
Exposure is, of course, up to you to set the "mood" of the shot.....
What I might have done, since it is a shoe and implies motion, even if abated; would be to have left more space towards the toe rather than the heel....
Thanks for the comments. One could argue that the shoe itself is overexposed, but i personally like it because it is strongly separated from the dark background behind it.