Got a drawing wich was "Not good enough"

My girlfriend and i was visiting her sisters and we saw this, according to her "just a drawing", we could have it so we accepted of course and now it hangs on our wall.

She had numerous ones and all just as beautiful.
We said she should try and display her artwork but according to her she not "good enough".
She said there loads of people better than her, and we tried to tell her that she's better than most people.

Wouldn't really listen.. first is our drawing, the other is from her insta, don't have her concent to put her name out there but if you guys like it, it may give her some encouragement.

What do you guys think? Would like to hear your opinion.