There are many applications to edit and retouch the photos on cell phones, but these are the best ones.
Snapseed
with Snapseed We can edit photographs in a very simple way and obtaining a result that could be qualified as a professional. In Snapseed you can always adjust options such as brightness and contrast control, exposure controls (saturation and warmth) or colors, shadows and ambiance, which improve the overall contrast of each photograph.
also this application has an advantage over the rest, in the last update you can also edit photos in raw format.
Adobe Photoshop Express and Lightroom
Adobe Photoshop Express is a relatively broad solution that provides access to a high level of personalization and optimization for mobiles. With this practical application with multiple functions, you will be able to edit photos of all the sizes (including large formats), as well as to trim, straighten and rotate images, adjust the colors and eliminate the eyes.
If you want to go further, a payment package will allow you to add new photos to minimize the noise (grain) of an image and other optimization options in the photographs taken at night. Once modified, the edited photos can be shared on the fly.
VSCO Cam
VSCO Cam is both an application to edit your photos and to take them. The editing of images is done through many filters, which you can also download new ones, and you can always see the change with the original image.
PIXLR
application for editing photos with which you will prepare images in a short time and share them to taste in social networks. There are many effects to get an excellent "cosmetic" edition (red-eye removal, shine and skin smoothing). Includes a collage mode to combine multiple images into a single one.
Prisma
an application that reconstructs your photos with artistic effects following the style of famous painters. The app is free to download and, according to its creators, will include interesting new features in the future, like videos or live broadcasts.
invite you to try these Apps.