4 Color- Monochromatic paintings-
Enlarging a 6 inch by 9 inch image into a 12 inch by 18 inch painting
Start with a 1 inch grid on your reference image- if there isn't one you will need to add it.
The images I provide already have it on them.
Take the larger 12"x18" paper and mark every 2 inches on the bottom, top, left and right
Use a long ruler or straight edge and connect your marks vertically and horizontally.
DRAW LIGHTLY!!!!
Start slowly drawing your image box by box. It may help to number them to keep track of each.
This is an example of a reference image with a 1 inch grid on it.