Which is the right way to criticize a person?

Give them light suggestions politely on how they can improve their work or self rather than just saying 'you effing suck!' Or 'ew, that sucks, change it! Change it! Change it!', 'that's so tacky, you don't wanna be caught wearin that.' There are ways to set things straight with people without actually hurting their feelings. Try to practice on being polite and not harsh with the comments like those examples above rather than being a two faced liar with your opinions if it really isn't all that good. Kim: Hey what do you think of this dress *shows tacky dress* Sally: Errrgh, it looks good on you. Hurry up, ang change! We've gotta go. [Goes to event] Nick: What the hell is she wearing? Steve: Looks like major road kill with a side of poultry. Kim: *runs and cries to the bathroom* Sally: *chases after kim* , hey Kim! Wait up! What's wrong! Kim: People didn't like my dress! You said it looked good on me, and they said its ugly! Sally: That's not true. Kim: Yah it is!!! Sally: Well it is hideous... Kim: You liar! You said you liked it! Two faced! Sally: I only said that so I won't hurt your feelings with your choice! Kim: Well good going, my feelings are hurt enough because of the humiliation I have to face. Scenario 2. Kim: Hey sally, what do you think of the dress. Sally: Hmmm... You do need something of an eye catcher for the event... Oh! I know, try this one! It will make you look like the Angelina Jolie of the ball. I'm so positive it will look great on you! Kim: Ummm okay... You sure not this one? Sally: Yes, yes! *gives dress* Now go! Kim: *changes into dress, comes out* Hey sally, what do you think... Sally: [thinks to herself in her head: I should have worn that dress], It looks stunning on you! Now I gotta go get changed. *changes into some sparkling red outfit that is as great as the dress kim's wearing* Kim: OMG you look hot! Sally: Hahaha, thanks. you think steve will like it? Kim: Hell yeah! Of course! [goes to event] Steve: Whoa, who are these two lovely ladies? Nick: Ummm... possibly our dates. END!!! So scenario two is my example of what I was talking about, rather than scenario 1. Scenario one can hurt the person and make them sad. There are many ways of breaking things to someone without hurting their feelings in a harsh way. Sure you might make them fell somewhat uneasy with the situation but they'll like the idea in the long run when everyone else likes it. Cheers and happy lotting.

This is very good advice. :) You have to be gentle but honest in your constructive criticism. Feedback is very good. Not blaming is also the way to go. Understanding and communication are very good. And definitely compliment them on their strengths. Well-said! Thank you for this! :)