You need to study the Help notes about Container fields, e.g. at:
1. you can take pictures on an iPhone/iPad and have them store directly into your database using FMGo
2. if you use External storage the FM database does not bloat, as the images are stored separately in a location managed by FM
3. you should consider, in your database design, setting up a separate table for your images
4. if you are going to be using images with FMGo you may need to look at using FMServer; it depends on whether it will be must you using the db I guess.