Brian, I actually like the bike better as well. Both convey the basic concept of open conveyance, babe, and billowing skirts revealing lingerie - or bits of it. The bike is more detailed; visible engine, spokes, and cables and would be more interesting to paint, but... the scooter might be easier to render in slate - no engine, spokes, or cables - and thus easier to paint and hence, more appealing to the tyros. There is method to my madness.
Slainte,
Glen