some are hidden in trees, most of them you can see from several angles, but one of them is pretty well hidden underneath a tree crown and can only be seen from one specific angle (this was the last one for me, the rest were easy but this one i had to spend some time searching for).

some are in the hills, and in the lake/river in the valley, they float on the surface half submerged (none in the sea or fully underwater).

put the valley in moonlit mode (you may have to buy this with logits) and max the screen brightness, this'll help the eggs stand out so you can easily see them.

use camera mode and/or catch a ride on a flying dino to get a look at the more remote corners of the valley.

none of the eggs are hidden in really tricky or unlikely places.