How to draw Transformers Bumblebee step by step

I used STAEDTLER water colour pencil in this drawing.
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music :
Bay Breeze by FortyThr33 https://soundcloud.com/fortythr33-43
Creative Commons — Attribution 3.0 Unported— CC BY 3.0
http://creativecommons.org/licenses/b…
Music promoted by Audio Library https://youtu.be/XER8Zg0ExKU