Disappointed

I ordered a 17"×11" poster of a piece of my artwork to see how it looked to decide if I wanted to order more to sell in my small art business. The art looks great but it only covers 10"×12 3/4" of the (17"×11")poster. Over 2" of blank white paper on the sides makes it look cheap and corners where cut to save ink. I don't want my art to look cheap.