focus is fairly sharp but the color is very blah. It's not your fault, it's just that the onion is not a very colorful object. However, I am bumping your score up 2 notches from my first impression.
This would have been a very outside the norm image if the detail of the onion had carried through to the right side of the onion. The odd lighting bleached out the detail. The lighting needed to be better controled to reduce the odd sparkles from the onion juice on the left. The image does workk well with the background.