It's kind of annoying when someone shows what they're working on, and the first comment is always, "Oh yeah, here's some alternatives." It feels like less like you're trying to be helpful and more like you're just kind of cheekily crapping on them. 2 cents. Maybe it would be more helpful if you were to ask how it could be different, what it improves upon. Ask if they've seen this. Something more than, "Oh yeah, here's something in addition to what this person is trying to show."