You can get a perfect Group photo through this app. This app take your group photo and allow you to edit each person photo individually with correct face expression.
Buy this application source code and make your own application within your budget. You don't need to hire any iOS developer to develop full application, just customize this app source code and send it to App Store for Review.
Files Included in Source Code:
.h, .m, .jpg, .png, .xcodeproj