Grid and Grayscale Image Tool
This tool will apply a grid and grayscale to your reference photo (without needing to use any tedious software).
Step 1: Upload your reference photo below ("Choose File").
Step 2: Wait a moment while your photo is processed.
You will get three versions of your reference photo: one grid; one grayscale; one with both.
(NOTE: If you are on mobile, press down on the image and save to your photos.)