You can change the interior by clicking on the icon below. Check the image size to the ruler of the left bottom of the first interior.
You can add picture frames by selecting the ''Change frame'' button.
To upload your room interior, take a photo of the room with the wall and it's surrounding. Choose the photo file with the taken picture after pressing "Upload interior".
Size of the painting can easily be set according to the size of the items. Use the mouse to move the painting to desired location.