Hi Kort,

I recommend a minimum of 35%,  because as an artist, you are actually spending very much time working on this for that client. What kind of blows chunks in a gallery show, is that a gallery will take 30%-50% as a commission.  15% makes no sense to me, too much work for that low of a percentage. (I do admit to going that low in the past, but prefer not to go that low again)

Kurt