The first two shots are of animals and ripples on the water.
In the spring shot above there are two turtles above the water and two turtles mostly below the water and the ripples give an abstract feel to the lake. In the recent shot below, one canada goose and one mallard equals two water bird creating ripples on the water.
The final two shots are of ice on the lake last week.
I think it looks like ripples were frozen into the ice. Is it just me or does it look like the Loch Ness Monster is submerged in the shot above. I'm referring to the dark mass in the center left part of the shot above.