While the finished mural and characters aren't exactly my style, there is something thoroughly enjoying about watching skilled artists do their thing.  I also think that most art made "big" is even more amazing as it lends itself to standing back, looking in awe at the large work in front of you.
Not to mention well shot "making of" videos showing the techniques, methods and skills used in creating the artwork always makes you appreciate the end result more.

This video showing Supakitch and Koralie making a mural is somewhat mesmerising I think.  Watching the sweeping, amazingly precise lines of paint, the intricate marker work, even airbrushing... lovely.

And I know it's a terrible cliché to say this at this point, but... it really does make me want to go and do some myself.