Well hell, if no one else is gonna do it, I will.
It's not a bad sketch by any means, and truth to tell the pipe doesn't bother me as it has a strength of composition greater than it's obvious drawback of lack of lips. If you feel that point is bothersome enough, design a mouthpiece for the pipe that you think would function with the beak.
There are some things that
do niggle me though, and to one extent or another they could be more effected by the original Kenku illustration than any descriptive text, I can;t recall off the top of my head.
1) Overall, he looks very crow-like, as opposed to the more squat, curved-beaked Kenku I'm familiar with. Go back to the descriptive text and double check to see if you've significantly deviated from what a Kenku is supposed to look like. And if you have, determine if you care. If not, that's cool, but you should have done it on purpose either way.
2) His am/wings. Specifically, they aren't wings at all, they're arms. Wings would need a wider, roomier sleeve (and conform to a less arm, more wing-ish shape) than the ones you've got there. Again, if it's a decision you've made on purpose, that's good ole' fashioned Artistic Liscence (TM).
3) Were it ME, I'd do a little more work on the design of the glasses. Given his bird head with big honking beak, he needs glasses designed to sit on a beak. Not much work needs to be done on that score, really. Again, it's more along the lines of Things you need to have considered'. Nearly all of this falls under that label, honestly.
4) They're right, his legs are too thick.
5) Back to the pipe. The "He's got no lis" part completely aside, that pipe-stem has a sharp upward curve. If he has lips of not, if he puts that thing in his mouth he's going to dump smouldering tobacco on his face.
I do like the choices in clothing, and his pose is great. He has the right kind of laid-back, leisurely-but-strongly interested feeling to him that you were right to go for. Your technique is fairly good, allowing for potential shearing up and tightening given that it's still a sketch.
All in all it's a nice piece, the "He's the wrong kind of bird for a Kenku, isn't he?" reaction remains my strongest.