Hi,
here's the blocking pass where i used mostly insert sphere and move brush (it was helpful to have design reference in background to start blocking some spheres),
then here i did a quick gesture draw over to give me some bearings when continuing, i may do a couple more drawings like this before continuing in 3d.
cheers,
Nate
Inspired by Ken Hultgren's The Know-How of Cartooning (pg 41)