I'm not an expert in the field of brows, but my take is limited to how far I am inspecting females in general in my area, look at how the shape is, and kind of go from there.
My picture is outdated, and well not really resembling but still resembling my own.
Figuratively speaking I've seen every brow under the sun. The range of brows varies greatly from person to person, some with a very pronounced arch, thin with a slight arch, thick with a moderate arch or even pure bush. I myself have not gone so far as to purely feminize my brow, but to what I can by sort of giving my brows a more defined arch by going by the bottom toward when they curve/taper out, to provide where I am comfortable, I may try and go from the top where its closer to the bridge of my nose to thin that part and give more definition toward the arch, but I have not attempted that as of yet.
There is no right brow, but a professional would be able to help you out to start your own course of beating around the bush (sorry just had to say it). But if it may be all under, or even over, or some under and over, for you to shape your personal look, to what you would consider for yourself. Then by all means give that a whirl.
Maybe you could get a feel perhaps if you are PhotoShop literate you could take a photo then toy around with the shape of the brow, of thinking from the bottom and or top to get a general idea, or just getting a professional in on the matter.
Kate <3
