What you have there are a couple rocks.
A huge portion of the human brain is devoted to interpreting other people's faces. Part of our survival hard-wiring. Also, the brain decides what your eyes are seeing and part of it's job is filling in the blanks for missing information. A swishing tail or twitching ear may be a tiger. The brain fills-in quite a lot so we can function. Want to see a UFO or ghost bad enough you eventually will.
So, when the eye begins to interpret a shape the first attributes it processes are: is it a face? That's why people see faces on rocks, toast, etc.
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Are you implying river rock should only be in rivers? Most "river rock" formed under oceans 450,000,000 years ago and what are mountains now didn't exist then. It was still sea bottom. The tallest mountains are usually the youngest because erosion hasn't had long to wear them down.