Well, here it is. My first work with a clone tool!
Worked out pretty well I think. I left the flag, I like the foregroud interest that it gives and I'm not sure I could replace it cleanly anyhow. I also took the camera off the top of the building, it was a bit distracting.
Gimp worked really well on my laptop. Nice a quick, had all the tools I feel that I needed, and I'm pretty pleased with the result.