If it's any consolation, I thought it a wonderful scene and felt drawn in immediately. So for me, you succeeded in meeting the challenge requirement, no problem there. I also like the natural colour and light, it's exactly as one would expect to see, and again, it's simply a wonderfully charming scene. I gave it a 9 :)
I didn't vote on this.. but a 4 would have probably been my vote. Why? I don't see any lines leading to anything. All your lines lead *away* from everything, and mostly to the middle left of the photo.
It's not a bad photo in and of itself. Documentary type, good vacation photo, but the connection to the challenge is missing almost completely, and it lacks anything that would give DPC voters a reason to vote it anything high.
As for the 3 and below votes.. well, all I can say is that I was a pretty forgiving voter when I was voting, so I understand why they would have been given.. but your main votes were 4 - 6.. so focus on that.
I didnt vote this one - so I dont know who gave you the low scores. I like the image, but for the challenge it doesnt have a strong theme. The idea of leading lines would be that there are lines, arches, etc that lead my eye to the subject - in this case the lighthouse. The lines here lead my eye away from the lighthouse. I can only speculate that the low scores may have something to do with that.