Piano photo is added to source background, windows removed w eraser tool.
step 6 of 8
Sculpture seemed unnecessary, so I erased it with eraser too; also, took out some of window divisions to give a better view of background.
step 7 of 8
Here the cat on the piano has been further chopped, using large soft brush in contiguous mode, butterflies have been chopped, color changed with color/balance tools, and sizes changed with edit/transform/scale tool.
step 8 of 8
Finally, small cat is chopped and added to floor and his eyes are enhanced using the brush tool. Some lines are added to glass to show that it is glass.