«Can I get your feedback on this?» is three requests wearing one coat. Answer the wrong one and you will be told you missed the point, by someone who never said what the point was.
Appreciation, coaching, evaluation
In their work on receiving feedback, Douglas Stone and Sheila Heen distinguish three kinds. Appreciation says «I see the effort». Coaching says «here is how to do it better». Evaluation says «here is where you stand».
All three are legitimate and none substitutes for another. Someone who wanted appreciation and got coaching hears that their work was not noticed. Someone who wanted coaching and got appreciation hears that nobody will tell them the truth.
Naming which one, out loud
The whole tangle unknots with one clause at the start. «I'm not looking for fixes yet, I want to know if the idea holds» is a request for evaluation. «Tell me what to change» is coaching. «I just want you to see how much went into this» is appreciation, and there is nothing childish about asking.
The same applies when you are giving it. Say which you are offering before you offer it, and the other person stops bracing for the other two.
Evaluation drowns out everything said next
When a message contains a judgement, the judgement is what gets processed. That is why coaching attached to a rating rarely lands: the listener is still working out what the rating means for them.
So separate them in time. Rating conversations and improvement conversations can both be useful; held together, the second one is not heard. If you must combine them, put the evaluation first and clearly, then stop, and hold the coaching for a different day.
Praise is only useful when it is specific
«Great work» is appreciation with the content removed. It is pleasant and it teaches nothing, because the person cannot tell which part was great and therefore cannot do it again on purpose.
«The way you cut the second section made the whole thing readable» is the same warmth with the information restored. It costs one extra clause and it is the difference between being liked and being useful.
Asking for it in a way that gets an answer
«Any feedback?» reliably returns «no, it was good», because it asks someone to survey everything and volunteer criticism unprompted. Narrow it: «what is the weakest part of the second half?» presupposes there is one and makes answering easy.
And ask for one thing. «What is the single change that would improve this most?» gets a real answer where an open request gets politeness, and it leaves both of you something you can actually act on.
One hundred ways to look at yourself
Reading about it is one thing. Ten of the tests are open right here — no install, no account, nothing saved.