I saw Esra's work in Grafik July 2008 and has been one of my favourite illustrators since, the pencil work is quite efficient a lot of the time, only detailing what needs to be shown without the images looking too light which I want to come across in my hand drawn animation. Obviously the less lines used the quicker you can animate but a lot of hand drawn animation falls into looking very light and unfinished. The water colours obviously add a lot of dynamics to the images through very subtle use and filmed water colour bleeds could be composited with black and white line to keep the fluidity rather than paint each frame. The pitfalls of this are shown in the watercolour painted swimmers in a previous post.
http://www.esraroise.com/portfolio/selected-work