Illustrator - Ball with Drop Shadow
Blue-Gray Ball
Created ball with blue-gray color and applied gradient mesh at top left part of ball for light. Arranged shadow at angle from where the light was hitting top of ball.
Drop Shadow Effect: Mode = Screen, Opacity = 75, X =10, Y = 15, Blur = 8
Metal Tin Gradient Ball
Created ball from Metal Gradient Swatch "Metal Tin Radial". Highlight is in center, so I arranged
shadow in center under ball.
Drop Shadow Effect: Mode = Multiplicity, Opacity = 90, X =0, Y = 25, Blur = 10, Color = Black