6:58 AM, Monday August 16th 2021
I'm only at Lesson 4 now so take this with a sizeable grain of salt. But hopefully given I've drawn a bunch before DAB, this can still help. Take your own inferences, this is just my opinion/process.
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The major problem looks like the shape and flow of the feathers. But again, I don't have your reference.
As you haven't provided a reference, I'll work with the "sparrow taking flight" references I found on google image search. All of them have rectangular-triangular feather.
eg.https://farm5.staticflickr.com/4055/4311284187_547d0a1056_z.jpg
eg.http://blog.martinbelan.com/wp-content/uploads/2014/11/House_Sparrow_20141109_0001.jpg
eg.https://expertphotography.com/wp-content/uploads/2019/05/birds_in_flight_photography_sparrow.jpg
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From the underside, the connection between the front limb and the body is very distinct. There's some fluff on the underside of the limb, and the end of the limb merges into a feather.
The feathers are distinct only at the farther end are distinct/serperate, as you've drawn.
But, at the lower ends, the overlapping is quite 'sharp' and distinct.
Your feathers, on the other hand, are overlapped very haphazardly.
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My construction: https://imgur.com/a/SK07U6q
My process: (Mainly used the first linked image as reference)
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Connected the front limb to the body. Should have drawn through, sorry for that.
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Defined the outer bound of the wings with a simple line.
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Defined the bound of the fluff with a simple line.
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Started drawing the feathers one by one. The upper feathers overlap the lower ones in this reference. Add some lineweight if drawing through. Note the shape of the feathers. Also note the feathers start form over the fluff. From above, there's a layer of short feathers instead of the fluff which originate from the limb connection to the body.
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Made sure to break the silhouette with the feathers, and avoided drawing subtractively.
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Again, I'm not very good at this either, so don't take my word absolutely for anything here. And I am short on time so I didn't put too much time into my construction (sorry about that) .But I do hope I managed to help in some way.
Good luck!