If I was doing it for reselling then I would have spent another few mins on the rounded corners. Then it would be as perfect as necessary.
Most of the crappy images I get are like this so Ive learnt how to "repair" them using Corel. Usually have to adjust the tone first to get a good contrast and get rid of some of the rubbish ( Effects-Adjust-Tone curve ( change from curve to straight)) then trace it and play around with the corners.
Usually works a treat.