First: 
It's ok to assume NASA did that with photoshop.
Second:
You talk about a wall of ice that holds the water in place. What if you fly over it? space? then what keeps the air in?
Third:You take a plane and go east. Eventually you will arrive at the same spot. Why? because the Earth IS round.
Forth:The horizon
Your sight can see a star billions of miles away yet a ship hides in the horizon?
Assuming its mist: why is the mast the last part of the boat you see? If it where mist you would see the entire boat fade at the same time.
Fifth:
That is a long exposure photograph of the stars.
Do you think all stars rotate going in circular paths around the earth? Why don't they form squares? why do all stars rotate in circles?
It must be the Earth that is moving. But if the earth where flat and it where moving in a way to create those circles the water would fall. It would be like turning a cup upside down.
sixth:Concorde passenger view:
seventh:Why would science say the earth was round if they knew it wasn't true?
Eighth:How can it be summer in Australia when its Winter in the UK?
Ninth:TIME ZONES
How can it be day time in UK and night time in Australia?
Tenth:The SUN is round. According to your theory of flat earth the gravity would be something unexplained where everything goes down except the Earth. So why doesn't the Sun's Hydrogen and Helium fall down? Why does it form a ball?
If you respont to that with the tendency of those gases to go up then why does the sun "come up" at sunrise and "go down" at sunset? Why doesn't it keep going up?
Same questions with the moon.
Now the people who believe the Earth is flat should give proof of their claims.
PS: By saying the world is ROUND i mean it is a SPHERE.
PPS: An example of a SPHERE is a ball.
These forums are an insult to human intelligence and logic.... or a big joke. One or the other.