There's a 2MB limit on the size of images uploaded to Funky Frog and maybe your image exceeds this size.
If you uploaded your image from your handset, then the app automatically resizes it. If uploading from the Admin Control Panel however, then you need to be careful not to upload files any bigger than this.
We're working on a solution so that you don't have to worry about the size and we'll get that up and running as soon as possible.
Feel free to send an email to support@funkyfrog.ie and we'll check out the file and figure out why it's not appearing.