After we give a teaching demonstration or make a briefing, what phrase should we say to the attendees?
1. Your comments will be appreciated. More naturally: "Your/Any comments would be appreciated".
2. Thanks for your attention.
3. We welcome your comments.
Phrase #2 serves a different purpose to 1 and 3, but you can combine the two ideas.
"Thanks for your attention, we welcome your comments".
"Thanks for your attention, any comments would be appreciated".
"We thank you for your attention and welcome your comments".
not a teacher