I've been trying to make some walkable pebble/rock/dirt terrain for a hypothetical game. I'm somewhat pleased with the first two of the images below, but would like to hear more educated opinions. Which of the three methods would most likely result in something that looks at least slightly descent. Also, more specific questions, is the purple colors a good choice or irritating? And I've had some trouble with tiling. It seems that whenever I put any pebble/stone/dirt larger or weirder than the surrounding ones, it stands out and makes the repeating pattern noticeable. But without those unique pieces, the image looks even more repetitive and boring. Am I right in thinking that having a variation of tiles would solve this problem?
Thank you for any help and I apologize if my attempts seem elementary, I've only been trying pixel art for a few months.






edit: I changed the palette and shading on the fourth image, but it still seems very repetitive so i'll be working on that.