Amongst the things that I worked on was what is called Mirror Work [we are not allowed to post links so google it]. I'd stand in front of a mirror and look into my own eyes for as long as I could while saying things like: you're OK, you look good, nice hair, eyes, etc., you are just as good as anyone, you look just fine, those tears are OK and on and on as though I were talking to somebody else. I've found that NOBODY can do that exercise but it did me a lot of good to get past the self consciousness and self contempt that I'd had most of my life. My best Self Esteem teacher was Jack Canfield [google him] and I also attended a Self Esteem workshop where there were a lot of tips and systems to overcome bad self esteem. Another thing I did was to hold eye contact with pictures and images like I might see in an eye glasses store window. It was excruciating at first to hold the eyes of a mere picture in a store window and then to hold the gaze of a person walking by on the streets. Self talk and self approval are vital so long as I don't slip into some kind of self centered arrogance or selfishness which actually happened a few times while trying to improve my FEELINGS of self esteem/worth. I'd imagine you can find a lot about self esteem right here at this website.
good luck,
jim