Black eyeliner is good. Eyeshadow is not necessary. If you want to wear eyeshadow, don't use some bold color which really stands out. That's a turn-off. There are lots of articles online that have info on makeup and beauty trends that turn men off. Here is an example: link
I'm happy with nothing, but equally happy with just eye liner and lip gloss. If you wear a bit more, that's probably okay, but less is more.
What Girls Said 1
if you wear too much yes you will look different without it. but the truth is osmetimes when girls wear too much eye makeup it looks ugly, and they look better without it.
if you wear eyeshadow everyday make sure it is a neutral and subtle color. I personally think that eyeshadow is a bit much for casual days, I only wear it for formal things. I just wear eyeliner and mascara on a daily basis, I think that looks nicer.