I'm on level 15 on Easter festival and unable to get an ester egg to progress to level 16, what do..

Hi! Get a primer to unlock the bush; it doesn’t always product the egg but one of it will. You then need a Painter’s Palette which is from the Empty Mortar (need to get the max of the fruits (from Easter cottage). After that you need a paintbrush. Use the craft box to get the paint brush. Hope this helps!