The attachment doesn't look like it would hold the googles fast to the head.
You should add another strip, that runs around the back of the head or the chin.
Also in the image below, you can see that the body of the goggles almost perfectly covers the eyes, to let no unwanted light reach the eyes.
As for the polygon limits: You have wasted many polygons already. Especially for the grooves and holes near the end of the large horizontal cylinder. Those can easily be immitated with the skin/normalmap.
Instead you should spend some more polies for the lenses, as they are larger and attract more attention.
I usually don't adjudicate on unskinned models, as the skin can really make or break a model.
So skin it!
Well, my $0.02.