I'm starting to write patterns for some for the amigurumi dolls I make, and am thinking of listing some of them for sale online, just for a little hobby money. However, due to me having a lot of embroidery floss around and not wanting to spend more money on safety eyes online, I always embroider eyes and facial features, and sometimes even small details (though less often). Mouths are easy to write in, but some of my eyes are on the intricate side (for amigurumi, that just means there's an outline, a white, and a pupil) and I do them freehand. It's hard to pattern embroidery on crocheted yarn, so I'm not sure how I'd put it in the pattern. Embroidery patterns usually have something you can trace and pin to your project, but my eyes depend on the size of your crochet stitches, etc.
tl;dr For a high quality pattern, should I just say "embroider eyes between stitches * and * and rows * and *, * stitches apart"? Or should I say "Embroider eyes how you please, here are some tips on how I do them". I really don't want to go to safety eyes or buttons, I like the look of embroidery much better.