I believe that attractiveness is mostly subjective, but that culture, media, and society can direct what is viewed as "more attractive" versus "less attractive". For example, in the Victorian era, many "fuller figure" women were viewed as most attractive, versus the 1970's and 1980's where being thin was considered more attractive. Rough estimates and averages assumed for the sake of examples and ease of explanation.
In my observations, present day society, media, etc. display the more attractive men as muscular with strong jawlines, tanned skin, and overall 'macho' in appearance. Likewise, women that are held to the highest levels of 'beauty' often have dyed hair, fake nails, eyelash extensions (or at least false lashes, to make them appear longer), and also tanned skin (whether natural, via a chemical applied to the skin, or tanning beds).
To be honest, despite what men are shown to be the most attractive, I've always been most attracted towards men that are intelligent, clever, and usually have interests/passions that are more logic based rather than art-based. (I've been interested in a man finishing up his pharmacy degree, an engineer, etc.). I'm sorry, but if you're not intellectual and smart I just... I don't have the same attraction level towards you. A man with a sharp mind is far more attractive to me than the shell of his existence, (referring to his body). Besides, a man's mind (generally) lasts longer than his physical attractiveness.
As far as physical attributes are concerned, I've always been fond of men that have nicely sloped noses. Usually more of a straight bridge without a severe bump or sudden change in angle/slope of the nose. Hard to describe, I guess. And even teeth. I enjoy looking at a smile that has some even teeth, (they don't need to be perfect), and teeth that doesn't display much plaque buildup or yellowing (I like people with decent hygiene). To be honest, I don't really like the whole 'macho' stereotype. I like a down to earth man that won't mask their feelings. I like a man that can tell me how he's feeling without feeling like I'd judge him differently or that I will look down on him for crying, being upset, or being worried about something. I feel as though those men are labeled as "sensitive" but to me, I consider them being "real" and "open" because I feel those are emotions that every person is capable of feeling, whether they're men or women, and we all have those chemicals that make us feel a ray of emotions depending on the situation we're in and I like when a man can be honest about those emotions.
However, all that being said, to me, a keen clever, sharp, and smart mind is far more important and attractive than looks.