Can you solve the puzzle by identifying the error in the picture below?

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Answer: There are no human footprints.
Footprints in snowy weather are inevitable. So while the dog left footprints in the snow, his companion did not.
Hey, dear friends! Get ready for an exciting visual challenge that’s bound to put your eyes and mind to the test.
We’ve got a puzzle – like picture here, and it’s almost complete. But, there’s one crucial part missing! Can you be the detective and spot that missing piece?

This is a bit of a race against the clock. We’re giving you just 15 seconds to find it. Think you’re up for it? Let’s go! Your time starts right now!
15…
10…
9, 8, 7, 6, 5, 4, 3, 2, and 1. Time’s up!
So, did you manage to spot that sneaky missing part?
If you did, kudos to you! Your sharp eyes and quick thinking are truly impressive. But don’t worry if you didn’t.
This puzzle can be quite the brain – teaser, even for the most eagle – eyed among us.
If you’re still scratching your head, don’t fret. Just scroll on down, and we’ll reveal the answer.
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R

The answer might seem simple once you see it, but it took a really careful look. Paying attention to every little detail was the key. So, how did you do?