What does it tell you?
This lopsided smile shows a lack of respect, in fact a strong disrespect, for the person taking the photo, for the process, for the wrongness of his deeds. Yes, he will do it again. Caution. I predict that this man will abuse his wife if he ever marries.
What we would rather see in a convicted criminal is shame. The face would be symmetrical, no smile, the lips being turned in on each other. The less lip is showing, the more shame.
Note to self: I went to merge the nonverbal and body language tags, and I believe I accidentally deleted nonverbal instead of merging it. Use "communication" tag to seek these entries in the future.