This year I was invited to give a couple of talks and workshops at SketchUp's 2018 Basecamp event in Palm Springs. Whilst my main focus was on Scifi illustration with SketchUp, I also included a short breakdown of my workflow.
Whilst I use a full range of tools professionally and at home, one of the core elements of my hobby work is using SketchUp in combination with Photoshop (with some rendering for highlights if the subject suits).
You can download the resource files here: https://drive.google.com/open?id=1QWF4BWWBuoxObL6OueYUEp_D9uVG5TgN