Into the Wardrobe

hi. i do design for a non for profit children's theatre company, and they have fallen in love with this image of lucy and the wardrobe:

i've heard tell that it is from a Narnia calendar from years past. does anyone recollect which calendar, still own it, know the artist?

or are you an artist yourself and think you can create something as lovely for a nominal fee?

thanks in advance.
kristen