Eggs are very difficult to paint. If you paint them too uniformly in color, they become lifeless. You have to paint the minuscule color differences without them being visibly painted. There is no sharp edge, no angle, no symmetry, no line to "grasp." Every mistake stands out immediately, even minute distortions. This is why academies often use eggs as practice. Anyone who can paint an egg convincingly can paint anything. Henk Helmantel can do that.