Fill the squares to make your picture, using the colour by number sheets or your own designs on graph / dot paper.
Make empty squares black so they show up as negative space on the Yoto player display, which lets the image float in space.
You can use your phone to take the photo of your drawing, then edit it into a square using the phone's built in tools.
Tap the icon next to any track in the MYO editor, then choose Add and icon, then choose Photo Library.