I would be really into it if men casually wore eyeliner
Why do you like when men wear eyeliner?
There is something very attractive about the manliness of the guy combined with the feminine beauty
I sounds like you like a feminine quality in men, which is totally okay. You are able to express your preferences for whatever you are attracted to, as long as you don't exclude others.
Men should wear more makeup.
That's fine to have that preference. Just don't expect a lot of men to fit that mold.