Depending upon how confident you are, you could try a trick that I once saw Dick Talleur pull off with pretty decent results. He took some black and some orange/yellow paint and colored fake jungle cock eyes right onto the fly at the head where the cheeks would be tied in. The results were okay, and I'm sure that the fish didn't mind when they saw the streamer (I believe it was a grey ghost) moving through the water.
Did it look authentic? No, not really, but it passed for a pair of eyes. I'm not confident enough to try this, so I just bite the bullet and use jungle cock. I'd hate to tie a beautiful streamer and then ruin it with a botched paint job.
If anyone else has a suggestion, please share with us. And thank you PM for bringing this up.