Hi there,
This sounds like an easy project and I expect it to take no longer than 2h.
I don't have an ios device, but I have created image upload forms that allowed taking a picture directly within the form, and never had any complaints about it.
Ready to start as soon as awarded. The front end will be just a simple form (happy to include image preview at this cost), backend can be PHP or nodejs and we would submit the image using an AJAX request.
Image would be stored in a directory predefined in the app (easy to change), or it could be in the same directory where the script resides, giving each upload a random name, making sure it doesn't already exist.
Not sure if we need to give some sort of feedback to the user doing the upload, let me know.
Regards,
Julijan