Artists should not commission... well, me, parrotkee. There is a reason for such. I would offer commissions and when I actually get accepted by a customer, about halfway through the plans I reject the whole thing due to my everchanging emotions and personal problems.
A real artist should be able to keep their word if they say they gonna do your commission, not bail out on them or have their emotions interere with your work. If anything though, I don't accept money till after I finished, but that besides the point.
Long story short, don't commission me. That is all.