Services like Extract.pics or Picspectra allow you to paste the blog post URL to scan and download all included images.

Long-press the image until a menu appears, then tap "Download Image" or "Save Image" .

Right-click the image and select "Save image as..." to choose a folder on your device.

If right-clicking is disabled or you need to download multiple images from the post at once, consider these tools:

of the specific blog post where this image is located? How to force image to download from new blogger image link