FortunaPhoto

Hello, I am editing some maternity photos that the mother would like printed on canvases. She is going to display them in a collage on the nursery wall. My question is, how do I crop the photos to the preset canvas sizes without cutting out part of the photo. I have attached: 1. The original photo with the baby's dress and the 8 X 10 canvas crop that I did where part of the dress gets cut off. 2. The original photo of mother and father and the 20 X 24 canvas crop that I did where their legs get cut off. TIA!