AFAB vs AMAB makeup is a different art, so unfortunately it's not surprising that your partner's instincts on where to put highlights / shadows / volume was not to your liking.
I paint miniatures as a hobby, and I've come to realise that most of the principles transfer to makeup. First off, get a set of makeup brushes if you don't already. Some things to note:
- know how to properly "load" your brush (after dipping my brush in liquid foundation, I work it in with a few swipes on my hand)
- thin coats of foundation are your friend, less is more
- add highlights to the center of your face (nose tip, forehead between your brows, eye bags, etc)
- if necessary, add shadows/contour to the outside of your face ( sides of chin/jaw, beneath cheek bone)
- eyeliner should be applied with your eyes open, unless you're fixing a line toward the end
- having some q tips or an old brush to wipe off excess makeup is huge (eyeliner, shadow, lipstick, etc)
Most of the time, foundation looks bad if you can see it. If you are happy with your skin, don't wear it. Make sure you are using a colour that matches your skin tone. Repeating myself because it's important, less is more.
Echoing what others have said, HRT does help a lot with makeup looking more natural. I'd say my skills a year ago were about as good as they are now, but in that time HRT has helped what I do look more "correct" for lack of a better word. Most days I don't feel the need to contour, just using concealer for highlights.
Getting a face of makeup and not liking the end result is horribly dysphoria inducing for me as well, which made practicing really difficult initially. I will say that it gets better with practice. Just like voice training, the light at the end of the tunnel is there. Good luck ๐ฉท๐ซ