I once had a block on my worst vowel (open mouth, no sound, do you feel me?) and this block took soooooo long and I maintained eye contact all the time. The poor man keeped looking back at me. It was sort of a service man and I tried to explain what I whished to have done with my motor home (sorry for poor English). Eventually he looked away. That was the ónly time it might have been beter to break the eye contact, take a deep breath (sorry), lower my voice, make eye contact again and try again. This block took so long, it became too akward and maintaining eye contact didn't seem to help either. In every other case, please remember, that eye contact, at least to my opinion, is a very powerful tool and if you manage to keep your facial expression relaxed to some degree it's even more powerful. That's the only thing my 25 years ago speech therapist was right at (I realise now). And, no, eye contact is never creepy, it can become awkard at most (and only in case of very, very long blocks...)