Hi norbu did you use a monopod or something? The colour saturation is amazing because the resolution is excellent too. I researched GIMP and it is not recommended for my S7 unfortunately because the developer has not updated it. Worked a treat for your S6 though very pleasing shots. Hard to believe from a phone TBH! KUDOS, The colours are other worldly! The beach sand sounds that way too, thanks :)
Read next
From @richibald