Provide ideas with exact links for posters/pictures/paintings in a particular size photo frames which I already have

Hello I bought photo frames but I need help with choosing print/photos/paints online which I can add in the frames I bought. I need someone with a good design sense to choose print/photos or water colour paintings from the following websites: [login to view URL] [login to view URL] There are 4 frames in total with the following sizes: 2 frames: 39 x 49 cm 1 frame: 27 x 32 cm 1 frame: 20 x 50 cm The living room has light grey leather sofa, marble table and nikel legs and white TV stand. The paintings chosen need to match the style of the living room Many thanks Alex