If it bothers you, and will continue to bother you for years to come, fix it.
If it's not too bad, and you can live with it, let it go.
I'm working on one now that there are a few areas that just aren't perfect, but they're close enough and not bad enough to take out the stitches and redo.
It's all about what you're comfortable with. And you probably want it to be perfect for your mom, but what's she going to notice??
Really like the statement above about the "galloping horse"...