Nice one mate.. It is indeed quite picturesque, And it's one of more than many other attractions in Bangladesh to woo in tourists
But one friendly advise though, I'd refrain from making statements like "Probably" The best or most Beautiful or the biggest or the most stunning, Because making such lofty statements just brings about posters belittling each other, Everyone here thinks their homeland is the best, Beauty in the the eye of the beholder somewhat.. The thing is mate, Even South Asia is a vast region with so many different topographies, Natural and man made wonders in abundance.. India is a humongous country with so many climatic and geographical zones, So you can imagine the number of stunning natural wonders they have, Pakistan with it's mountains and valleys are stunning and as a alpine nation along with the other Himalayan nations of Bhutan and Nepal have some of the most stunning mountainscapes which includes many stunning waterfalls, Sri Lanka in it's own right claim several famous water falls given it's tropical and sub tropical landscape, It's a very wet place as you can imagine.. Would love to visit Bangladesh some time and visit all these places, But i'd stay away from making general statements just to make another thread a dick measuring contest..
Cheers
Btw a few of the more more famous waterfalls from my homeland Sri Lanka, There are hundreds
St. Clair's falls
Devon falls
Dunhinda falls
Bakers falls
Diyaluma Falls
Bambarakanda falls