The problem with critiquing your own work is that it is hard to break away from your own biases. The best remedy for this is to get someone else to critique and edit between drafts, but if that’s not possible, then I would recommend the American Idol* technique. That is, you split your inner judge into three, and give each one a certain task.
Note: Don’t worry about how silly this is. You might find it helpful, so try it out.
Dawg, you need some general appraisal. Randy works closely with your first instinct - did the overall impression of your creation make you want to get up and dance? Or did it hit a sour note? Whatever your inner Randy says is probably going to be what your audience thinks. Just make sure that you’re in a relatively objective state of mind when deciding to offer yourself props or if it just didn’t do it for you.