Whether entering a contest or not, contest score sheets have been a great source of help to me. I like to go through them and grade my own manuscript. If I can tell where something isn’t as strong as it should be, then I know where I need to work on my writing.
I usually go to Stephie Smith’s Contest Chart for Writers to find contests taking place. After clicking on a link and going straight to a contest site, I can usually find a sample score sheet available to glance through. Too many times, I've found areas I needed to give a facelift.