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Yer the white needs another coat in some places but other wise its very good nice job
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White needs to be done in many thin layers.
I would go over parts again because some are looking very "sketchy"
Not bad freehand though. but i think it could easily be neatened up by pencilling the drawing on first
I plan to live forever, so far so good.
I'd avise painting a coat of grey or brown on the black before you start painting white over it, depending if you want cool or warm shading. Building up to the white is a good way to ensure that it paints evenly and looks good.
Whenever I have a miniature that has large white areas (or yellow or bright red) I prime white. It makes it so much easier and smoother. Then if you want an area of black for a base coat, like the mail on your guy, you can always hand paint the black area. I find it easier to paint one coat of black on the areas I want black than to try and paint many smooth layers of white even when layered up from a brown undercoat.