I’m actually going to answer with three anime that really impressed me; Darker Than Black, Phantom: Requiem for the Phantom, and Blue Exorcist. I really like how the art in these three series are fairly realistic in terms of body (and face!) proportions compared to other anime. They also have really pretty, fluid animation; I especially love the way the movement is done in Blue Exorcist, and the focus on eyes in Phantom and Blue Exorcist. I think the fight scenes are what really caught my attention in these anime as they involve lots of movement which looks super cool.
I also want to answer for the most interesting art, and this goes to [C], with its really weird clashing of different styles in the Financial District. Although the faces have a tendency to look elf-like, there is a lot of experimenting going on with the art, and it looks awesome. The fight scenes are also really interesting.From this I have learnt that I really like to watch pretty fights.