The third option definitely looks more complete, but that's because it's placed on a textured background. The others look unfinished because they're on a white background. Hence the question – will they remain on a white background? A texture as a background is still preferable, although it consumes more resources. Overall, I think the fourth option is also very interesting if it's also placed on a background. It's more original, and the link system is interesting. Since it's dark, it would be appropriate to place it on a lighter background.