To transfer pictures from your iPhone to Android, first you need to transfer pictures from iPhone to computer. Since iTunes is too complicated for beginner, and there is risk of data loss, here we will take some third-party apps as example. Also, you can find some recommendations on: 10 Best iPhone Transfer Software
Step 1: Download a iPhone transfer tool on your computer and launch it.
Step 2: Connect your iPhone to computer. The software will recognize your iPhone automatically.
Step 3: On Photos library, you can find all photos on your iPhone. Here, you can choose pictures to transfer. Then, right click the chosen pictures and select to transfer to computer.
Step 4: Connect your Android phone to computer, and computer will recognize your Android phone as a hard disk. Then, directly transfer those photos from computer to your Android phone.