I give "likes", "hearts" or "appreciations" to designs I like, to designers I know, sometimes I will give "like" to designer from my area. But when I am thrilled with some design, I will wright a comment. This happens in five or ten percents among the designs I have liked. So, for me, giving a nice comment is achievement, one step above the usual "likes". Sometimes I will just wright "fantastic work", sometimes I will explain why I like a particular design so much.

When I want to discuss and receive a critique, I will rather send my work in progress to my friends - designers I appreciate and trust their opinion.