What is in a title?

What makes a good title? and is it subjective? My daughter and friend both think I can do better for my coloring book than the title I had chosen. I am still struggling with the amount of work that goes into what will be listed as a low content item. I am struggling with the coloring book altogether if I am honest.

I love the cover I made for it. But I don’t like how the scanned art has a off shade to it that will print funny. Or just the way that putting the book together for this is. I suppose I am finding fault with the whole project. I am a perfectionist and there is nothing perfect about this project.