App Store often rejects apps on visual quality scale. Here are some of the tips to improve your app quality:
http://code.tutsplus.com/tutorials/killer-tips-for-iphone-and-ipad-icon-design–mobile-4006
http://code.tutsplus.com/tutorials/app-store_screenshot-design_iphone-desig–mobile-4251
Don’t use default system font. Instead use some slick fonts like Avenir, Helvetica Neue etc.
http://despreneur.com/best-free-fonts-for-mobile-app-designs/
http://stackoverflow.com/questions/14376941/how-to-use-custom-fonts-in-iphone-sdk
Don’t use default system colours. Instead fire up your favourite graphic editor and experiment with some colours. Its good to start with a iOS UI kit. e.g.
http://www.teehanlax.com/tools/iphone/
http://graphicburger.com/ios-8-gui-psd-for-iphone-6/
http://freebiesbug.com/psd-freebies/ui-kits-psd-freebies/
http://www.teehanlax.com/tools/iphone-sketch-app/
http://www.sketchappsources.com/free-source/609-ios8-ui-kit-sketch-freebie-resource.html
http://www.sketchappsources.com/category/ui.html
http://www.uxpin.com/ios8-ui-kit.html
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