I took these shots a couple of months ago now but forgot about them. This activity is becoming a bit of a habit for squish. We're having to keep pens out of reach as much as possible, but of course we don't manage it!
I'd say she spent a good half hour concentrating to ensure that she covered as much area as possible.
The photos were all taken with pretty much the same settings but I've edited them slightly to subtly change the colours.