I repainted Bumblebee with metallic gold.

Repainted his rockets silver.

Modified his stingers so they would fold all the way into his arms and not stick out.

Make a reproduction of the autobot symbol for his chest.

Made a couple of weapons for him: a shoulder cannon that becomes his muffler in alt mode and a hand held stinger missle launcher.

Painted details all over him to be as accurate to the cartoon as possible and still keep him from looking too simplistic.