Hi Georg,
Of course I love sienna colors and that's what there's a lot of.
The rectangular shapes are too many. Once iis great, twice is pushing thrice is excess. The curved ?automobile" reflectlion, is distracting to the rectangular elements, or vica versa. Simplicity!
Simplicity is the essence of a great photogrph but it is not then simple because we can now add more. This is crowded. However, the process is positive and we're moving. The frame is a difficulty since it calls too much attention to itself at this time. First the image and composition, then the frame. For the moment grey card: a flat border just to allow attention to the picture itself.
Remember, what I say, like fools and brillian critics must be taken, sifted and discarded according to your own values and measures since it's your experience that has to be satisfied. My esthetic sense is just my own. However, the struggle in appreciation might perhaps include a helpful elements of feedback.
Asher