The actual Diamonds looking different from their murals I don't see as an issue. While Gems have a set base form for their bodies, aside from shapeshifting they can also regenerate different styles of clothing, move their colors around, and change some aspects of their hair.Amethyst has the most dramatic, from flash back to current form, she seems so childish and *little punky kid* but something as minor as a change of outfit and hair length/style makes her the "grunge mom" of the group.flashback:more recent *not current, but close enough*Keep in mind they are the same height, same build, same face. She has simply changed her attitude, clothes, and hair after more exposure to humans.As for the dream in her eyes, well if Occam's razor for anime, fantasy, and sci-fi tropes has taught me anything, highest probability is by some convoluted means (there are a number of possibilities, ranging from dark too Rose Quartz was a soulless monster though) that Steven is actually Pink Diamond reincarnated with Rose Quartz acting as the healing/power source and Greg's DNA masking/fused with the Pink Diamond shards (Diamond's being an organic gem *carbon*) reformatted into human tissue by whatever means RQ used to make Steven in the first place inside her.