I'm sure that at least 50% of the resumes/pics get thrown in the garbage for the following reasons:
1. The picture is totally unprofessional. Wear business attire and have a head shot done against a plain background.
2. Tripel chek you're resume+cover leter for grammer/spelling error. (Haha!)
3. If the job ad states that they want scans of your diploma, send them! Ditto with reference letters, etc. Incomplete applications just get thrown out.
4. Don't say that you "just want to make money" or "I want to travel to Asia." Instead, maybe you could say, "I'm considering teaching as a future career, and I'd like to get some experience in this field" or "I'm very interested in ________culture and language and I'd like an opportunity live in _________ and work closely with some students."
If you do these things, you'll have beaten out most of your competition.