Adding photos to your Blog has not fundamentally changed. Follow the simplified steps below of watch the video tutorial:
- Change the state to shared for each photo (in Google Photos) you want to make public in your photos.
- Create an album(in Google Photos) with the images you want to share.
- Add image from "Picasa" in Blogger. (I suspect this name will change soon)
- Select the images you want to insert from the shared Photos album.
See an example of the workflow above on YouTube