Having pictures of an area where the horizon appears flat doesn't prove that the Earth is flat any more than standing under a shelter proves that it's not raining.  It's just an area of land which appears flat because, believe it or not, the Earth is pretty damn big and you can only see for a few miles at most.

If you want to believe that the Earth is flat, go and send up a camera tens of miles into space to check for specifically you as thousands of people have done before, but don't just claim that the Earth is flat when it's 100 metres up and can't see the whole Earth yet.

All of our best and most relevant scientific knowledge suggests that the Earth is closer to a sphere than any other shape (or an ovoid).