Sherlock glanced at the girl again, smirking to himself as he thought about the fact that she probably didn't know what a 'deep thought' actually looked like, but for the moment at least, he held his tongue.
He leaned away from his work to give her a better look. He didn't know who she was, but appearances were always rather telling.
"Have a look, then." He couldn't keep the slight bite from his words. If she was so interested in his work, maybe she'd have some input. Probably not, of course, but it might give a moment or two of entertainment. Women. "And tell me what you think."