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So this is my first try at the organic pumpkin shape. For HO scale I have exagerated the depth of the grooves. With a nice thick primer and a coat of orange, I expect they'll come out nice. I've been applying Daniel Smith white Watercolour Ground (thinned a little with water) as a base coat for models like this, as it then allows you to stain the surface with watercolour or very dilute acrylic paint, building up the colours with more natural variation than regular paint. Happy Halloween.