Picture shows a horizon. Looks round to me.
No Selectrick, there is no proof or even a hint of evidence the Earth could be flat in any way. Try and ask any one of them dozens of times and you will never be shown any evidence in the list bit, except the occasional quote of a bunk book from 1872. Go ahead and ask every FE here for any evidence, no matter how tiny that the Earth is flat and you will never receive it. They will simply ask you for proof the Earth is a sphere, in which you will list the proof, in turn which they will say all your proof proves nothing. Rinse and repeat.