There are several things wrong with the pic:
1) First of all, the trope relates to a big failure that defines a hero. The character in the pic is not a hero, but a very minor mook, and his failure isn't even addressed in the actual movie.
2) The pic does show the character feels bad about something, but he could be just as well be generally depressed or sad. Even if we assume he's looks like that because he's ashamed of something, there's no indication he's thinking about his "greatest failure". Maybe he just farted in front of his superior officer, and that's why he's so shameful?
3) The only way to know the image is related to "his greatest failure" is to read the caption, and the caption makes no sense if you haven't seen the movie.
To sum it up: the image and caption can't be understood without having seen the movie, and even if you understand it, it's not an example of the trope.
Here's a suggestion for a replacement:
It's not perfect, but at least it shows that, A) the character has failed at something, and B) he feels really bad about the failure.
edited 17th Jul '12 4:26:54 AM by Tuomas