Some good places to find images to add to your want list include:

- The ChipBoard
- The ChipGuide
- eBay
- The Collection Library
- Other collectors web pages
- Google searches

Whether you use your iPhone or scanner, you may want to think about cropping your images to a standard size, say 240x240, and keeping them square. Also, if you want to eliminate the various backgrounds in your iPhone pictures, you can circle-crop them using PhotoScape (free image software). Good luck.