Ready for real photo editing on your smartphone? Adobe has you covered: Photoshop Touch for smartphones adds the core Photoshop capabilities, Scribble Selection and supports those high-res snapshots. The app also sports the handy Camera Fill and other special effects alongside the option to share creations via Facebook, Twitter, email and other apps, plus Creative Cloud with 2GB of syncing among any of your devices, including desktop Photoshop. There are also some requirements in terms of hardware: for iOS, an iPhone 4S, 5th-gen iPod touch or later while Android requires Ice Cream Sandwich (Android 4.0) and above.
Photoshop Touch costs $5 on the Play Store and the App Store.