First off, very cool image, and thanks again for taking my tutorial and running with it. I love the rounded corners on your secondary shapes. Were those all hand painted? Or did you use a technique like selecting an area and using the Smooth function in Select to round the corners? Great use of 45 degree angles, and I'm happy to see you've got areas of visual rest and areas of super detail, really helps move the eye around the image. Also dig the shadow of the spacecraft. And love all the overlapping levels. About the only suggestion I'd make is maybe a few smaller tertiary details on the larger primary shapes, nothing so strong as to clutter the larger shapes you have, you'll want to retain that, but perhaps a little bit of low opacity extra shapes to keep them from becoming too simple. Great stuff, can't wait to see more if you decide to continue pushing the techniques.
Thank you for taking time to critique this image Neil!
The secondary shapes were created with the lasso tool - lots of time spent using this method!!
And I appreciate the suggestion for 'breaking up' the larger shapes, something I will attempt with my next piece (for I will most definitely be using this technique again!)