My Artist Library, and the skills I'm going to need to build

Bruce Timm - DC Animated Universe

• Simplified Anatomy
• Action Lines
• Strong Silhouettes
• Simplified clothing (ideal for animation)
• Angular drawing style

Bryan Konietzko (Avatar: The Last Airbender)

• Extremely expressive faces
• Simplified facial attributes (easier to make expressions)
• Plays a lot with facial proportions
• Strong poses (stronger than Timm's)
• Action Lines
• Good understanding of anatomy, wrinkles, fat
• Still simplified anatomy
• Generally rounded
• Sub Style: Der-shing Helmer

Eiichiro Oda - One Piece

• Always keep in mind that he's bad at drawing women, unless he's doing an extreme body type.
• Switches between simplified chibi-ish style and strong anatomy
• Strong shapes and silhouettes, especially on larger characters like Franky and Kuma
• Plays a lot with body proportions. Keeps everyone a certain number of heads tall, but they may have a giant torso, or really long legs.
• Extreme scale. Things tend to be scaled up to a ridiculous degree, like Water 7 being a giant fountain.
• Heads and hair tends to have strong silhouettes (see Franky, Kuzan, Sengoku, Blackbeard)
• Lots of extreme body types, when he wants to.
• Lots of normal body types, too. Zoro and Sanji are muscled normals.

Hiromu Arakawa - Fullmetal Alchemist

• Well defined noses (weird for anime, and mostly only on older characters)
• Strong anatomy, generally not simplified
• Strong facial anatomy as well on older characters
• Differences in faces are made primarily by varying mouth, nose and eye sizes, and varying face shapes, although they're mostly either round, triangle, or heart shaped, with a few squares on the men.
• Functional, mostly realistic designs

So the final list of skills is:

• Anatomy
• Strong Poses and Action Lines
• Silhouette Design
• Extremely simplified muscles
• Extremely simplified clothing
• Facial Anatomy
• Expressions
• Drawing mundane things at large scales

And of course, the big two that I need to learn before I learn those: Construction and Design. Those will take time, of course, but they're also the most fundamental skills, and will be just as important.

Several things have said that I should also pick a master to study from, and Leonardo DaVinci has always been one of my engineering idols, so he's the natural pick for me now, as I learn to draw.

Here's hoping this all goes fairly well!