CONE shaped? Surely not; I don't think I've EVER seen conical breasts; the closest I've seen were actually in real life. For Fantasy Babe we need HEMISPHERES. Unaffected by gravity (unless animated, in which case they will Gainax very effectively)except *maybe* for about a .5" of sag to give a rounded undercurve. That's "realistic", you know. The hemispheres may include additional cylindrical and roughly half-inch high nipples if the venue allows it; you can probably get away with hints of nipples under the clothing if not.

On the other hand, if you actually GAVE that instruction to the artist, but you're not the one holding a gun to their heads, you'll probably end up with a black-haired goth-girl in leather armor at night, and looking adorably grungy.