This stunning book includes 48 gray scale images of beautiful animals and creatures of all kinds waiting to be colored by you. (geekwrapped.com)
I have worked in pen and ink for black and white but am not sure of gray scales images. (self-pub.net)
Do not scale the image itself to make it fit into a specific location or space, as this can cause images to become too small to be viewed well. (ebookflightdeck.com)