I'd put some stripes or something on the tie if I were you.
Not loads, just a few, at least that way it'll look less like a penis. lol.

Because, I would have figured it was a weird red one too, if I had not have seen your reply.
It looks like a penis, but then you do realise the guy is wearing it; tie.


Since the man and woman are stood, I'd add something to give that indication.
Just some little 'dispersions' and reflections of the people would do a nice job.