I've been following MaryDoodles' youtube channel for a while now and I'm never less than impressed with her art work. She posts time lapse videos of her creating her wonderful ink and watercolour pieces - it's fascinating to see the image emerge from a blank page. She also has a second channel for vlogging, etc. and she's a very interesting, engaging person.
Around hallowe'en she tends to get a bit spooky, like her latest video at the top (can you see the hidden wolf? Look for it's eye and teeth!) and this one, The Cat of Frankenstein, from last year. but her subject matter usually veers to the nerdy/pop-culturey anyway.