We know that designing can be a bit of a pain if you're not familiar with genetics. We've put together a simple guide to follow for designing though encourage you to google horse colors and markings to have a better understanding of what they should look like.
Coat ColorsAncient [e-/a-] nW [E-/A-] nWAncient Quirlicorns have white base coats with a single color for markings of any shape and size on top of the white base coat.
Black E-/aaBlack horses are well, black. While they don't have to be pitch black, they need to be within a range of blackness that can still be considered black rather than grey or any other color.
Smoky Black E-/aa/