By genetics do you mean skin details? Aviera has really pretty default (replace ea eyes) and non-default eyes (add swatches to eye color selection). https://aveirasims.tumblr.com/downloads
I know Kinjiko has eyelash options that are in the skin details and the eyeglasses categories. You can have them both in your game at the same time. Your Sim can wear rings with the eyeglasses category ones but not with Skin Details and for obvious reasons your Sim cannot wear eyeglasses with the eyeglasses version.
Skin details: http://kijiko-catfood.com/3d-lashes-version2-for-skin-detail-experimental/
Eyeglasses: http://kijiko-catfood.com/3d-lashes-version2/
I would suggest looking for nails that are somewhere other than the rings category and add those to your game as well. Try typing Sims 4 fingernails gloves.