After many trials and tribulations with Illustrator and Photoshop I finally managed to come up with what I wanted... things have moved on from the idea of the 'brick brogue' to the image above.
First draft on my Tree of Soles idea, drawn on a kraft paper in pen, which I then scanned and digitally coloured, see below.
Below is my original idea of a hand drawn image which I wanted to
digitally render, and then got sidetracked into the image below - the denim brogue!