But, the icon would only lead to my posts, so what was your idea for me to be able to see another user's posts?
The idea is in this topic: Member filtering widget [◇/◈] (SMF patch). (The specifics have changed compared to what was presented in that opening post, but it should still give you a good idea of what I have in mind.) 
(Re-reading that topic made me smile, particularly that last post of mine: like anyone cares that I'm a "warm" winker, and not a "cheeky" winker.)
I don't really see the benefit of doing that to be honest, unless you will be able to access this from the "Show latest posts from this user" page.
Hmm... I think the piece of information you might be missing is that I'm imagining those face-containing icons as being one way to quickly get at all the posts you've made within a topic. Another way, of course, would be to just navigate to any one of your own posts and then click on the filtering-widget (basically, clickable face-containing icons don't really factor into this whole idea much, they're just a semi-helpful option for when you're looking at the topic from the outside: like when you're just browsing the board, or in the watchlist, for example).If you find yourself in a situation where you don't know whether or not you've posted in a given topic (but would like to know), and you can't get eyes on any of its potentially face-containing icons, then the thing to do (after the patch is merged; obviously doesn't work ATM) would be to manually add your UID to the URL, like this (using WO [1] as an example): https://bitcointalk.org/index.php?topic=178336;u=2739424.
[1] Not the best example, because that thread is basically pegged to the top of Speculation, but, yeah, I'm sure you get the idea.
