But using tutorials is what helps people progress at a faster rate, so don't listen to him. Keep using tutorials until you get good enough to do stuff on your own.
Well one of the main problems is the cut placement. There's usually an unspoken rule that you don't place a cut where there is an edge visible, like the one where Sable's legs are cut off. Things like that look odd and stand out. The backgrounds okay. Little simple, but it's not bad or anything. And the text seems to be fine. Just work on your cut placement, and your cutting skills.