The one on the right is substantially better in most ways. Neither
of them qualifies as photorealistic though, so if "realistic" is your
goal, then you need to either do more work or lower your standards.
Not being derogatory here--true photorealism is really difficult,
expensive (in terms of compute time), finicky, easy to screw up, and
very seldom necessary. Honestly, both of these are quite good. The one
on the right could almost be a slightly posterised photograph at first
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