Thai Ambassador to Bangladesh Panpimon Suwannapongse inaugurated the exhibition as the chief guest.
Addressing the occasion, the Thai envoy appreciated the artworks of the young artists.
A total of 45 artworks of the four artists -- Juton Chandra Roy, Suman Kumar Sarkar, Kamruzzoha and Maneek Bonik, who mainly work with water colour to portray the natural landscape beauty of Bangladesh, have been put on display at the 15-day long show.
"We, the four participating artists, work on landscape of both urban and rural beauty of the country," said Juton Chandra Roy.
The artists in their works tried to bring out the culture, lifestyle and natural beauty of different regions of the country, he added.
Gallery Cosmos Chairman Enayetullah Khan said an affinity with nature remains one of the mainstays of Bangladeshi artistic inspiration.
Depicting nature in water colour is perhaps the most quintessential form of art from Bangladesh, he said, adding that through such exhibition, Gallery Cosmos looks to shine a light on the present generation artists' engagement with nature.
In the presence of Panpimon Suwannapongse, who is also an artist, Khan also talked about possible initiatives which can be taken as part of the cultural exchange between Bangladesh and Thailand.
Suman Kumar Sarkar, another participating artist, said the arrangement of such an exhibition encourages the young artists greatly.
Gallery Cosmos Director Tehmina Enayet said Bangla word 'mrinmoy' means something out of clay and the four young artists painted the artworks out of their passion and thought for the nature, making the works exceptional.
Talking about the artworks, prominent artist Kalidas Karmakar said water colour has developed a unique style in Bangladesh over time. But to promote Bangladeshi art and nature on the world stage, the style needs to be upgraded, he said.
Mentioning that water colour mainly belongs to the Asian region, especially the subcontinent, he also urged the young generation artists to experiment more and go one step ahead for more advanced and contemporary ways to bring out the nature of Bangladesh through water colour.
The exhibition will remain open from 12pm to 8pm every day until September 27.