Artist and booster

[babochka]

can anyone share experiences. Are there jobs for artists promotional? For example, window dressing, or kom.zakazchik request to paint a picture of the order (ie with a given specific topic, maybe even color scheme, plot). As you work (if it happens) with such an order? reworks all of 100 times? (as happens in the interior design.). or stipulate immediately any certain conditions? (how? what?)
I just faced the fact that the holding of such an order (as the "want to eat and do not consider myself a" great master of the art ", I am looking) I have to work for much less cost than finished work, or, for example, are a potential sale in the gallery .. and the customer is always changing his mind (as chiefs in a mountain-style company), if work is not reworked, but simply redrawing the line in the drawing.