Help?

Um, I can't figure out how to adjust the main picture. Every time I upload a picture, it blows it up so it's jumbo sized. I checked the box "shrink to fit" and everything, and it still doesn't work. The last one I did came out to be a close-up of my nose. :( At least this one is Charlie's cute little chin... I've tried and tried but can't figure it out. Any tips?