This picture can be colored with many different techniques. Kids can pick out their own way to color the picture in a beautiful colorful manner. But one of the preferred ways to color the pictures can be starting with the background.
Try thinking of a hockey game and give the picture colors you see there to make it look realistic. You can make the floor of brown or grey color and add a darker color on the sides.
The background can also be of brown or grey color. You can use different shades. Once done with the floor and the background, start coloring hockey player. Give his skin same color in all areas like a light brown and then color his cloths with green and blues. His helmet can also be of matching color to his cloths. The skates can be of brown color and the hockey can also be a shade of red.