Here is a link to the app Copyit that I used for the grid on my iPad: https://apps.apple.com/us/app/copyit-the-grid-drawing-method/id377185812

There are other similar apps you can try out.

Please enjoy your free preview of my course How to Draw a Pet Portrait!

If you'd like to purchase the course find out more info here:

https://mollysfineart.teachable.com/p/how-to-draw-and-sell-pet-portraits

Leave a comment below and let me know your thoughts on the tutorial!