Awesome collection mate
Regarding your problem: You click on 'Upload a File', choose your picture(s), when it's uploaded it's attached under your new message. Then you can choose between "Thumbnail" for a small clickable image or "Full Size".
If you can't see this option you need to go to your Profile - Preferences and make sure those preferences are activated:
- Use the rich text editor to create and edit messages
- Use the Flash-based uploader to upload attachments
With my latest arrivals (Sweet smell of success, Thief & The Red Shoes) and "Brighter Summer Day" on the way I'm at 64 Criterions