The best conversion software I’ve found is Calibre, free to download. It does a great job and in about 15 seconds! One of its best features is the ability to add or change the cover photo, especially useful because I find many epub files don’t have a cover photo.
The photo will be created as a PDF and saved on your device. To convert the pictures, here are few apps that can help you. Google's Camera can make your life easier. It contains functions to convert the image to a PDF using some programs, convert it to an image and the best yet, save it in your gallery. Google's Camera will not only do the job for you, but also automatically create an image of your photo. That way, you'll be able to view it from your gallery. You can search for the image as you like. You can save it, edit and share it in various places as well. Furthermore, you can even apply filters to enhance it. Furthermore, you can even edit the photo of your favourite filters. The Camera and apps that can do all these functions are FREE. In fact, Google also provides a great deal of useful.