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To convert photos from PDF documents, I refer More reliable and easy to use program, you can use Kernel for Image to PDF Converter Tool. It is quickly convert photos and wallpapers. That software also support JPEG, .JPG, .BMP, .PNG, .JFIF, .TIFF and .ICO. That software supports almost OS version like Windows 2003, 2000, 2008, XP, Vista , Windows7 and Windows 8.
The software also available free trial version. imagetopdfconversion.com
I would just install CamScanner (available on Google Play). There are other choices as well, such as Handy Scanner (as Jim Lynch suggested) and Doc Scanner, but I prefer CamScanner. Easy to use and has a nice, clean interface. You definitely have the right idea - it is so much easier to keep track of stuff when I can just snap a quick photo instead of holding onto lots of little pieces of paper.