@georgia A fair judge would not see guilt in words alone, but motivations (an unfair judge you can't possible account for). Your question then becomes not of specific words, but of your own motivation, and you pondering on creep makes you suspect. If the eyes are of your coworker are indeed beautiful, then that is wonderful, enjoy them every working day. If you are unable to enjoy them without expressing your joy, specifically to a coworker who you see every working day and who's eyes you enjoy, then is it indeed the eyes that you enjoy or the prospect of seeing those eyes in your bed as a decoration, through coercion or otherwise?
I can realistically imagine, if you indeed enjoyed the eyes, the day either you or them quit, to have a conversation to keep in touch, in hopes to see and enjoy the eyes again, for which you would need nothing more than an occasionally meeting. Such conversation can be held without even revealing the motivation, out of tact. If this does not fit your case, and you proceed with your out of nowhere and going nowhere complement, one may at some point at the very least accuse you of lying about your feeling, and anything further you would say in your defense one may use against you in this meta-court of intrigue.