1.) Normal sig size is 500 x 200 2.) Nice render cut, but too big, try duplicating it several times with different modes i.e screen, multiply, overlay etc 3.) Bg and render color scheme doesn't have to be an exact match but must be of similar hue, contrast with colours that complement each other 4.) Download brushes from
www.deviantart.com >>categories>>resources>>application resources>>photoshop brushes....be creative with the brushes use mainly to add to the render 5.) Go to the tutorial section of soccer art and practice a few.....with practice and time you'll be good