Heya, now that works quite well!
Bump on zero is not cheating, hahahaha, OMG. If anything, having bump could be considered cheating by some. But I like it. However, I still don't like the way I keep building up bump with the brushes. I should figure out an elegant way of letting it settle like a puddle of paint would. I'll keep my head on that topic for a while, I think, because it's really kind of annoying.
It's surprising, now that you mention it, how little trouble I'm having with just one undo (per layer, at least!). Odd thing, I could most certainly add countless undos, if I felt like it...or rather, wasn't scared where to put it, because at some point gfx-memory might fill up - OR I forget about it and by the time I manage to go to higher resolutions this will nib me in the butt.
Back to you, what I always admire about your sketches is that you seem to have a certain feel for achieving a lot with a few well placed strokes. I noticed that on much earlier canvarion scribbles of yours. If you had nerves for it, you could really bring the best out of Verve with that skill.
TIP: Fill your canvas with a color. Crank Fluid-smudge to 99% or so and flatten the canvas down (hold shift and smudge around). From that moment on, paint with around 60% opacity and you should be able to deal with the bump quite well. Taking it down to 20% or less is actually most natural. In some ways the bump height simulates the real life scale of the painting (logically speaking).
TIP 02: Work consciously with the fluid-smudge amounts! Consider the effects of Fluidity, too, because it's often worth to adjust it to your desires! Remember the pen pressure minimum size, too, which can be very powerful, if you use pen pressure!
TIP 03: You can crank Fluidity up high and turn your opacity to zero to just float paint around (not using Shift). Adjust the remaining fluid parameter to your needs. I often turn fluid-sharpness all the way to 100% and fluid smudge to 90%-100% for some curious whisps, for example. But even at gentle, precise strokes high fluidity can be extremely powerful and feel fantastic! small brush size...ah...curious stuff, very surreal/novel!
Again, great job, though! Considering that you're using only few features of Verve, this is indeed impressive!