"low self-image" is correct and can be used in written English.
It is used to refer to a lack of confidence or self-esteem. For example: "I had a low self-image which led me to make poor decisions throughout my teenage years."
"This club had a very low self-image when we got here," he said of Middlesbrough.
And before I got to college I had a really low self-image, really bad body image.
In her first season on "E.R.," Ms. Tierney wore her hair nearly shoulder-length and straggly; it wasn't flattering, but it complemented Abby's low self-image.
As a loving bond between Eugene and Alma deepens, Alma's low self-image exists in inverse proportion to her determination to go to New York, a place to be somebody.
For the next decade, she said, she variously abused alcohol and recreational drugs and developed disordered eating as she struggled to reconcile her low self-image with her high profile.
His insecurity, low self-image and, in particular, his sense of guilt and shame mark him as a possible depressive: it's not only that I did this thing wrong, it's I'm a bad boy.
Such idealizations can contribute to low self image at an older age.
Of course, they are not the only things that would contribute to a low self image, but I love to sing and I still sort of wish the birds would sing along with me due to Snow White.
People with perceived stigma may have a low self image and be socially isolated which may predispose them anxiety [ 30].
People with perceived stigma may have a low self image and be socially isolated which may predispose them depression [ 30].
People with perceived stigma may have a low self image and be socially isolated which may predispose them to CMD[ 40].
