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THE CLIENT - person who pays for and receives the piece of art.
1. Do some research on the styles the artists are capable of.
Many artists favor one style/medium, while others are talented at a variety of techniques. If you're looking for one style in particular, it would be useful to cite a specific piece when you ask for a commission. On a similar note, asking a person who does sculpture to do an oil painting might not be the best idea. Not saying a sculptor cannot paint, and not saying it isn't worth it to ask... But depending on circumstances it might be a better idea to find an oil painter ; )
2. LOOK FOR COMMISSION I