$400 deposit is a lot of money for no work being shown. But honestly unless you got a receipt saying what was agreed upon with that 400 you're in limbo. If you have a receipt with an agreed upon time for completion of the sketch and dated appointment then you have leverage for your money back and the ability to give that money to a better organized artist. But if you never got any agreement on paper then your easiest resolution would be wait for him to get back into town. Best advice anyone could give would be get an agreement in writing before you drop any amount of money for a deposit, and dont do business with someone who forfeits on their agreed schedule for that amount of time. Regardless of if you get the full amount of your deposit back I personally would choose an artist that takes the situation more seriously, (he did let you find out through the shop, instead of a personal call)