A Study In Canine Facial Expressions?

You may recall this photo from a recent post on hiking Monument Mountain. My sister said that Fergus' face looked very unhappy and she could tell I'd placed him up there against his will. I had lifted him up there and he did look unhappy, so I began to wonder:

Here's a close-up of that same facial expression. Is this a happy dog?:

But Fergus was always looking - well, concerned, so I clipped the hair away from his eyes to see if that changed his expression. His formerly hidden eyes then became big, round, bright, perky eyes:

But he also tends to look shyly away when a camera is pointed at him. So I concluded that Fergus is a happy dog who looks unhappy when there's too much hair in front of his eyes and even more so when a camera is pointed at him. I don't think I'll clip the rest of him in the middle of the winter, but I'll keep his face more neatly trimmed from now on. By the way, do you think there's enough dog toys and rawhide chewies on my floor?: