Hi Aartturi,
Thank you. That size is fine.
There are a number of issues, but I'll address the technical issue first. You may zoom to between 100 and 200% to see what I speak of.
Technical Issue:
There is a thin line of blue color fringing to the right edge of the cup. At the top of the handle there is a wider band of purple color fringing.
Other Issues:
This capture is a bit under exposed.
The black, or shadow, or both may need to be adjusted in order to remove the dense black around the beans, especially those nearer to the cup handle.
If I were to correct this in post processing, I would increase exposure, reduce highlights and white a bit to maintain balance; increase shadows and black (by increase I mean slide slider to the right). This should give a better lighting balance other than the right being much darker than the left.
Lens correction in cameraraw sometimes takes care of color fringing. However if that does not work, and you use photoshop, the noise reduction filter tool does a good job most of the time.
I do hope this helps
Best wishes
JG