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The anatomy is also questionable... I really cannot tell which leg is suppose to be in front, and I can't tell if his arms are supposed to be bent or straight. There seems to be a slight bend in his right arm but it's very close to the shoulder, so I can't really tell if it's supposed to be an elbow or if his arm is attached oddly at the shoulder. I'd also fill out the hands a bit more so that they are more than just balls. I think a bit of anatomy study and starting with a wire frame sketch would really help you.
The composition of this piece is really boring. As a rule you never place your subject in the centre of your canvas. Rather you should divide your canvas into thirds vertically and horizontally and place your subject where the lines intersect.
Maybe add a soccer ball to this image to add some more interest and make it clear that it is supposed to be soccer?