Another possibility is this: 3) The pictures came out good . As you can see, 'come out' can take an adjective or an adverb, and 'nice' can be either an adjective or an informal adverb (the formal adverb being 'nicely': 'the pictures came out nicely').
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Anonymous how about meaning? Is there a slight difference in meaning between them?I don't see any, really—they are just vague expressions of approbation.