This is a very silly question and I really don't know the answer to it but curious to know.
Everytime I see the pics of suset on beaches the sun appear to go all the way down to the surface of the sea (as shown in the picture) but when I see sunset in my region , the sun disappears well above the horizon.
Why does that happen ?
EDIT :- A better picture of the sunset.
Your 3rd photo makes it rather obvious that either it's dusty, or there's a (rather uniform) layer of clouds sufficiently thick to hide direct sunlight from the camera.
If you watch such a sunset long enough, you'll notice that the solar disk disappears by gradually fading out, rather than by being cut from below as it happens in clear weather. So, either you need to wait for clear weather, or make your observations from a better location.
This is a sunset in the Corinth gulf in Greece on a clear day taken from Loutraki. Date July 31/'17
On the left is the Peloponnese promontory, on the right the the promontory of lake Heraion.
On the way to lake Heraion I stopped on purpose in Loutraki and took the picture exactly because the weather conditions were perfect to show a perfect dip of the sun behind the water horizon. Such clear weather conditions may happen once or twice a year during the time the sun is in the interval over the water.
You say:
Everytime I see the pics of suset on beaches the sun appear to go all the way down to the surface of the sea
It is not the beach that allows for perfect dips of the sun, but the water horizon on the west. In your picture the reason you can see the horizon is because the land faces west over water. Sea water on the surface of the earth has the lowest distance from the center of mass of the earth because of the nature of fluids, so it is the level at which the image of the sun will begin to sink below a well defined horizon.
In my picture there is a very small interval where the sun sets over water. The rest of the time the sea horizon is much lower then the hills seen on the left and right and it gets worse in cloudy and misty weather.
Sun cannot set well above horizon. However, there may be an illusion where sun's position at horizon may appear slightly different than it actually is due to atmospheric refraction. It may be useful to read this. Also, in the second image, there appars to be layer of clouds under the sun, maybe the sun is disappearing behind those while still remaining above horizon, i.e. not setting.
Extreme refraction. Next time you see it you may notice that the sun disappears from the bottom up (use the pinhole trick) as if it was slowly going behind the horizon. I've seen A video of this same thing.
I've seem this once and it was strange because I always watch the sun set before work at my night job and the trajectory of the sun would normally set on the horzion like normal.
But that one day it's trajectory was totally different, it Appeared was moving parallel with the earth's surface, rather than dipping downward. it ended up fading away into distance, conditions where very similar to the origional posters of this topic.
I also wonder how atmospheric refraction makes an accurate reflection, unlike heat waves that make objects blurry and distorted.
