Firstly they are right posting in the critique corner will get your image critiqued, just be prepared to receive harsh critique as it helps you improve.
Ask yourself, what do you like about your picture and what you don't like about your picture.
Then ask yourself in what way can your picture be improved.
The most important thing is to go back and try to achieve what you want by shooting again.
When starting out it is always difficult and it seems that everything does not go the way you want, we all went through it.