minimalist art... I like it...

Nice heal on the Polar Coor, Good Luck author!!!

Drop shadow effect is not a good idea for this photo since it makes them look like they are on top of an image, not in it.

I see where your coming from there. Thank you.

Also it would help blurring the edges of your objects. Easiest way is ctrl click on layer icon to select its contour, then go to Select modify contract by a few pixels, invert selection and apply gaussian blur.
The further an object is the more desaturated will appear, use this to create perspective.