I like v1. As a suggestion, you could selectively choose the sky and then use a noise suppression filter. This would eliminate the grain (noise) in the sky. I like the mono and the composition very much.

You have photographed this thistle beautifully. I like your viewpoint and the emphasis on the details of the flower's base, which is where the interest lies.
As to the frame...I frame a lot of my floral shots, especially, and of course they are a matter of taste. I think the heavily colored ones, such as v1 detract somewhat from the flower, but v2 and v3 are more pleasing to my eye at least. I usually choose a light color from within the image to use, and try to keep it from becoming too heavy. It all boils down to personal taste. You'll find yours, and if you like it, that's what counts in the end.

I rather like your version best. Old, and often crooked buildings are a challenge, and sometimes it's best to leave well enough alone. The image imparts a sense of the unusual nature of this village. Your colors are magnificent in this. Your lines are straight in the center of the image which is where the eye is automatically drawn, and the v shaped composition enhances that.

Fine shot.....
I would clone out the dark circle on the left just to clean it up a bit.
Very nicely composed.