Greetings,
A brief tutorial on the thought process behind sketch construction for organic critters. Something I've developed over the years, and I hope it may help you all out.
A little more thought on how I approach this.
• The "stick figure" phase:
So, can you draw a stick figure? Some lines and circles to get an idea of how you want something to look? It actually is very helpful in breaking down organic structures and can be applied to even mechanical systems that replicate biological ones. I often map out my drawings, whether sketches for sketch sheets or full illustrations, using, you guessed it, stick figures. It lays in the foundations for everything as it helps me establish my flow and movement in a piece. I find it makes the process less daunting, too, when all you have to think about is sticks and circles rather than forms.
• The "Mannequin" Phase:
This phase is a bit harder as it requires you to draw cylinders and cylindrical shapes in perspective and also in the form you want to act as a base for your anatomy to flow on. However, it's still a simplified version of the subject matter. In this phase, you are mapping out how big this character is, their muscle size, slimness, etc. It is a map for your brain to use when applying the eventual anatomy to minimize guesswork.
• The "Anatomy Construction" Phase:
Arguably the hardest phase, but once you have this done, lineart is smooth sailing. Now, please, and I hope you all agree, use references; there are many good ones. Sketchfab, Posemaniacs, Proko, to name a few. There is never such a thing as too many references, and there is always something to learn. And when you are dealing with magical, mythical, it helps to study a variety so that you can make better decisions on how you want something to look. However, this phase is all about mapping out the finer details of the anatomy and limbs. From there, you can use this mock-up to push your lineart more dynamically, whether you want to emphasize forms or not. You can make the decision because all the information is readily available, and you don't have to guess where to find it. It makes the inking process more enjoyable.
I hope you all like my first little foray into a PDF, and do let me know how it works for you.
Cheers,
Noct.