I don’t know how to answer this question. I guess I think up ideas like anyone thinks up ideas. Usually they just come to you, but they are influenced by the things you digest during the day—what you read, watch, listen to, dwell upon. I’ve looked at lots of children’s and fantasy illustration in my life until this point, the input of which has surely influenced my output! Also, my ideas are often dictated by the materials I use in my drawings. Watercolor by its very nature suggests certain images, something ethereal and indefinite.
I don’t know if this makes sense, but it’s the best I can do!