Added a new clipping layer above the bear and used a black brush to paint highlights. Created another clipping layer and filled it with black and set to color dodge. On this layer I painted the blue and red highlights.
Added some lens flares on a new layer filled with black and set to screen. I then chose colorize under hue/saturation to adjust the color. Added a new layer and filled it with black and set to color dodge. Painted the purple and green cast lights.