How can I search by image?

Search with a picture

  1. On your Android phone or tablet, go to images.google.com.
  2. Enter a description of the picture you want to find.
  3. Tap Search .
  4. Tap the picture you want to search with.
  5. Touch and hold the picture. Tap Search Google for this image.​

For More Information Please Refer: https://support.google.com/websearch/answer/1325808?co=GENIE.Platform%3DAndroid&hl=en