In the end, I was super glad this was a commission because otherwise I wouldn't have been able to finish it. Towards the end I entered in what I call "scribbling myself 'til I die" stage, where all I do is scribble details here and there in an attempt to reach that so miscalled "perfection". I have to internalize that, once the shading of a piece is set, there's little that can be done to fix whatever mistakes have been left behind in prior steps.
It was a fun and rather introspective piece to work on, and in the process I've polished a couple of tricks here and there, which means I've gotten a little bit better at being a filthy cheater and a total hack, hehehehe.
I've been sharing the WiPs for this piece over the past couple of days, so if you want a more detailed look at the process you can check the older posts on my Tumblr blog.