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Description
Here's a reference sheet I drew a while back. It had faded, so I went over the lines with pen and redrew the shading. Some aspects of my style have changed, mainly the connection of the wings to the torso. If you want a more accurate representation of my style, check out any of my other projects.

Details:
Infant (birth through preschool) Basically no motor control. Their barely feathered wings flail around uselessly. Most toddlers have tighter shirts to prevent them from injuring themselves.
Early Elementary (K through 2nd) Still no use. They have motor control, and basic musculature. However, their plumage hasn't developed far enough to do. . . Anything. Mostly they just remain loosely folded.
Late Elementary (grades 3,4,5) Can rise three feet in the air by flapping a bit. They can glide on strong air currents. Under duress they can fly about twenty feet in the air through frantic action.
Adolescent (grades 6,7,8) Can glide under any conditions (about 1 foot of decrease every five feet with no flapping). They can easily gain twenty feet of elevation before tiring. This is when they start trying to build muscle mass.
Late teens/high school (grades 9,10,11,12) At this point, they're physically able to fly, they just need to learn. Their wing shapes are generally long and flat; kinda lanky. Their wings widen as they age along with wingspan.
Adults have full capabilities.

Disclaimer: my Avians have never had tail feathers. I added them to the adult impulsively, it is NOT the norm. If you draw an Avian, you're welcome to add tail feathers and change the size/patterning of the wings. I'm speaking only about my characters in my world.
Also, Avians don't go to school. I'm just using grades as an approximate. Avians develop on their own physical schedule, similar to humans. This is just the norm, there are no guarantees.
Also, due to the varied gene pool, the physical achievements would differ from Avian to Avian. For example, Val is a soarer, with wings designed to glide. Adrian, on the other hand, is a flitter, flying by quickly opening and closing his wings. Both can fly in the other's style, but it's easier to stick to their own. You can read about Val and Adrian in my story commented below.

Thanks for reading and happy drawing!
Any comments would be greatly appreciated 😁

Description
Here's a reference sheet I drew a while back. It had faded, so I went over the lines with pen and redrew the shading. Some aspects of my style have changed, mainly the connection of the wings to the torso. If you want a more accurate representation of my style, check out any of my other projects.

Details:
Infant (birth through preschool) Basically no motor control. Their barely feathered wings flail around uselessly. Most toddlers have tighter shirts to prevent them from injuring themselves.
Early Elementary (K through 2nd) Still no use. They have motor control, and basic musculature. However, their plumage hasn't developed far enough to do. . . Anything. Mostly they just remain loosely folded.
Late Elementary (grades 3,4,5) Can rise three feet in the air by flapping a bit. They can glide on strong air currents. Under duress they can fly about twenty feet in the air through frantic action.
Adolescent (grades 6,7,8) Can glide under any conditions (about 1 foot of decrease every five feet with no flapping). They can easily gain twenty feet of elevation before tiring. This is when they start trying to build muscle mass.
Late teens/high school (grades 9,10,11,12) At this point, they're physically able to fly, they just need to learn. Their wing shapes are generally long and flat; kinda lanky. Their wings widen as they age along with wingspan.
Adults have full capabilities.

Disclaimer: my Avians have never had tail feathers. I added them to the adult impulsively, it is NOT the norm. If you draw an Avian, you're welcome to add tail feathers and change the size/patterning of the wings. I'm speaking only about my characters in my world.
Also, Avians don't go to school. I'm just using grades as an approximate. Avians develop on their own physical schedule, similar to humans. This is just the norm, there are no guarantees.
Also, due to the varied gene pool, the physical achievements would differ from Avian to Avian. For example, Val is a soarer, with wings designed to glide. Adrian, on the other hand, is a flitter, flying by quickly opening and closing his wings. Both can fly in the other's style, but it's easier to stick to their own. You can read about Val and Adrian in my story commented below.

Thanks for reading and happy drawing!
Any comments would be greatly appreciated 😁