Failed

I drew this at office, when it was lunch time xD My coworker asked me to draw this [picture][1]. I only spent 24 minutes to draw it. When I knew I was using the wrong colours, I closed the original picture windows then messed up the drawing xD
[1]: http://upload.wikimedia.org/wikipedia/commons/6/68/Mammatus_clouds12_-_NOAA.jpg