How Do I Create A Masculine Bedroom?

I have a very nice bedroom with coffee coloured walls and dark brown curtains. I also have very nice furniture that goes well with the decor. I don't want to change any of that, but I want to know how to make the room more masculine. Should I avoid ornaments and stuff on the windowsill altogether? I also have my PC in the room which throws out the possibility of the room being minimalist.