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It looks to me like they aren't sharp enough anywhere in the image, the depth of field is too shallow, they need better exposure, there are some blown highlights in the marbles (looks like a light or flash), and there is a bit of noise.
To add to what's been said, white balance is not neutral (too blue).
https://www.adobe.com/creativecloud/photography/discover/white-balance.html
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It looks to me like they aren't sharp enough anywhere in the image, the depth of field is too shallow, they need better exposure, there are some blown highlights in the marbles (looks like a light or flash), and there is a bit of noise.
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To add to what's been said, white balance is not neutral (too blue).
https://www.adobe.com/creativecloud/photography/discover/white-balance.html