Nothing really wrong with your shot Antonio, I think you did well, if you shoot Auto then you would get this kind of result fairly often, It's why many of us shoot Aperture Priority or Manual Mode. You camera's 'Auto' metering wont work too great in tricky lighting situations. I did a 10 second rework of your shot in Photoshop here
All I have done is used 'Levels' as your histogram was blank on the right side indicating the short is 'Underexposed' or 'Dark'
That was an easy fix, a tighter crop and sharpen and then you are pretty close!
Leave it well alone, I had one and its very soft past 120mm
Try the below link in future, there are many helpful guys out there both on the crew and not who will help you get to where you want to be
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