I think that I have enough Mud Mask screencaps for one or two pages at the most.
I don't think they will breed more ideas, unless they too will be very short.
So the scenes I have left are: - Pillow Fight - Scary Stories and Headless Horse - Sleeping in bed - Tree through window - Truth Or Dare - S'mores and marshmallows - …and a possible reuse of screencaps from the episode's prologue and epilogue (unless I've forgotten something)
If pressed and out of options, I will grab for screencaps from other eps, but I'll try to stick to "Look Before You Sleep" as much as possible.