Verified answer

Q) What are guys complimented on?

A) In terms of physical features:

　 Being tall = 背（せ）が高（たか）いね

　 Having a "long" nose (I'm not even joking, and this is something girls get complimented on, too) = 鼻（はな）が高いね。

　 Having round eyes = 目（め）がくっきりしているね。

　 Being in shape = スマートだね。

　 Otherwise, on their traits / abilities:

　Being nice = 優（やさ）しいね。

　 Being funny = 面白（おもしろ）いね。

　 Being smart = 頭（あたま）いいね。

　 Being good at sports = スポーツが得意（とくい）ね。

　Being able to play an instrument (like the piano) well = ピアノが上手（じょうず）だね。

Tack かっこういい onto any of those and it's even better:

____君（くん）って、背が高くてかっこういいね！= (Guy's name here) is so tall and cool!

People often use the word イケメン ikemen for being a handsome guy these days.

the greatest compliment would be ぜつりん

say you are 絶倫王

うまなみ、yours is like horse's.