One thing that I noticed was that the background and the sizes were different in both the original and the replicate. The first picture (replicate) shows that there is snow on the ground compared to the original and there are also more birds in the original picture than the replicate. The first picture from the original also shows that there are eight geese, but in the replicate there are only two and a tree trunk. On the second picture, the two differences were that, one picture was taken on land/grass (original), and the other one was taken in the water (replicate). There are only one female and a male duck from the original versus the replicate which consists of eight male and two female ducks.
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Suggestion
The term "I noticed" is a judgement in the sense that it implies that you noticed it, but other people may not have. In scientific writing, a difference is a difference, and there is no need to justify it further because everyone should be able to agree that it is a difference. This is similar to saying one "big" or "small" difference. You do not need to make an attempt to quantify it because that may vary depending on who you ask.
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Make sure all of this is in past tense. The verb "shows" is present tense.
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You should name the figures something like figure 1 and figure to so you dont have to keep saying original and replicate.