I have received critiques via email, in person, in Google Docs. I have shared scenes on this blog and received feedback. I have posted to forums, and I have listened to critiques over the phone. Different people critique at different rates, so it’s best to know your style of writing and critiquing in order to pick the best mode of feedback.
When I’m writing, I am generally very immersed. I tend to focus and produce a lot, rapidly. Every time that I have tried to revise slowly I have failed to complete a revision. I get board, distracted, or move on. I take it this means that I need to be as immersed in the revision as in the writing. The few times that I have done that, the results have been much better.
I need critiques from people who can look at completed drafts and make comments on the whole thing. I need to take a break in between the completion and the revision, but not so long that my brain decides to go in a new direction with the story -- which it will and has done 4 times in the past 7 years. With one story. So I need to work fast. Take short breaks, write shorter pieces, but never let the pace slacken.
When I am done applying changes, according to a per-decided schedule, I need to be done. I will tweak something forever. I will always see my pieces as unfinished works. Again, that is something that the years of reworking stories has taught me a bout myself.