Hello! Sorry for the long delay in response. I promise I wasn’t ignoring you, I’m just bad at replying in a prompt manner- especially when someone is asking for something that requires a little work to answer properly.
First of all, I suggest having a glance at my note about muzzles
Here: http://fini-mun.tumblr.com/post/158249507790/i-think-its-also-worth-pointing-out-that
And here: http://fini-mun.tumblr.com/post/165084181445/a-friend-of-mine-is-learning-how-to-draw-and-was
That out of the way let’s focus specifically on bird beaks.
The base shape begins the same as any other Sonic-style muzzle.
The next part I don’t tend to sketch because I can mentally visualize it, but the ‘mass’ of the beak is basically a big round shape projecting from the muzzle:
Next, find the corners of your mouth.
Use the circular mass you either sketched or visualized earlier to inform the shape and mass of your beak, and connect the lowest dip/point of the beak to the corners of the mouth. One of your corners is probably behind the mass, because we’re thinking in a ‘3d’ sense.
Viola! A basic bird beak. You can tweak this in various ways to make different sorts of beaks.
Example- by making the point of the beak less severe you can make something more like Wave’s.
Hope that helps!
Wait, what about the front and side of the beak?
General principle remains the same!
“Draw a regular Sonic muzzle, sink a spherical shape into it, follow the curve”. Bit more difficult from the front because you need to figure out how you how you want to contour the lines.