hanging with my imaginary friends

I'm in one of those thinking-crafting lulls, where you give brainage to how the story at hand could be better, more tense, more exciting, more whatever. So the love interest? I can see him now. He's morphed into his own unique person, not just a blend of character types I smashed together to antagonize my hero's journey. I can see what he's wearing. Hear the way he talks. Smell his neck. Feel the smoothness of his forearms. Taste how--

All right. This is getting a little creepy. But characters need to be alive in the brain before they can become real on the page. Now I just have to make sure all the stuff in mind translates into black and white, not forgetting to include the pertinent details at the right moments.