Excellent shot, nicely composed for a self-portrait, and making great use of the lens' rendering
Originally posted by FozzFoster Yeah I think I might just have a good copy, I can get good swirl on APSC!
The trick on APS-C is to have plenty of out-of-focus highlights out towards the edges, and to keep them relatively small - as you've done perfectly in this image. Of course, that works for full-frame too, but it's especially important for achieving the effect with a cropped sensor.
As always, the key to getting the swirl effect is a combination of camera-to-subject and subject-to-background distance, and a suitable background. Easier said than done, sometimes