So you have taken the photos. They are on the phone internal memory or on an SD card and now you want to view them.
So you could send the files by email or connect your phone to your PC and view them, wirelessly sync them even or use a HDMI Cable (if applicable) to view them on a big screen.
But when it comes to viewing them on the device on which you took the pictures then there are a few options. Using an Android device as an example the standard gallery application isn’t bad as a lot of devices will too sync with Facebook, Picasa and more.
However there are other options out there that do similar but different things and may be better for different people.
Quickpic
Probably the most popular photo viewer for Android it brings images to you faster, with more clarity. Thumbnails can be clicked for a larger view. You can hide folders or include them in an image search, delete, crop and more!
http://market.android.com/details?id=com.alensw.PicFolder&feature=search_result
Gallery Pro
Gallery Pro works based on the standard Android Gallery app but allows customisation of slideshow times, customisation of the thumbnail size and more.
http://market.android.com/details?id=com.gmail.kdjsoftware.gallerypro.media&feature=search_result