Go for it! I had an idea for a children's book many moons ago, even started doing some sketches and writing a plot. Never followed through with it and wish I would have. So why not! The wonderful piece of art that is Sparrows, tells me it would be a beautiful book.
I thought you had a lot of drawing in your gallery but when I took a peek it was all digital photography. Anyway, this art piece of yours is an amazing work! from a thumbnail size it looks real. Great job.