If you have a newer iPad you can use this tip!
Normally when I do my pixel art, I use a photo for a reference! But I get really annoyed how u always have to keep on exiting out of the app to look at the picture in my camera roll! This tip makes it easier to look at the photo.
You must have the update from like October on your iPad
First you swipe left on your screen to see this
Then click camera roll and choose your image
Now go on hopscotch and code and look!