WIP all over the place need opinions

[Sketchasaurus]

I'd probably change the timing of the wing flap animation. I assume that this is intended to be a rather large bird creature. In order to better communicate that size, I'd increase the amount of time in-between flaps.
A rule of thumb that i use when thinking of bird animation(or animation in general): the larger a creature is, the slower it moves. Specifically with birds: the larger a bird is, the more time in-between flaps. There are multiple reasons why this is:

• Larger birds tend to soar/glide more frequently than smaller ones
  
• Larger birds have more wing surface area which allows them to ride along updrafts more easily
  
• Larger birds' wings are longer and require more effort/energy to flap
  
• Smaller birds often have to change direction mid-flight more frequently to avoid larger birds that prey on them
  
• Smaller birds have smaller wings so they have to put forth more constant effort to stay airborne (generally)
  

Finding a good reference is always vital to improving one's animation. notice how a bird's wing sort of rotates forward as it goes down and how it essentially pushes off of the air beneath it to grant it flight.

'video ref  (slow-mo/looped)

 

It's also worth noting that this particular clip is a slowed down loop of a bald Eagle flying fast, or "sprinting" if you will.