Does he start with multiple sketches that he pitches to the rest of the team, like this:

And then move on to a more polished version:

Or does it work the other way around? I'm curious about whether the polished art is the set design for the mech, or if it's really a rough (not very, lol) draft that he then does multiple sketches of to really nail down some of the finer details.
(P.S. my forum knowledge seems to have degraded to the point where I don't remember how to put spoilers in, if a mod wants to add them in for me, go for it.)