In my own signed work I would not make a drawing from someone else's art, not even with changes. But in my art journal, anything goes. It can be fun to try out other people's styles and ideas, like trying on someone else's hat, to see if the influence will eventually influence your own style. Or just to do something different, outside what you usually draw.
Here is the original illustration by the talented Leanne Ellis of la-la-laillustration.