I think the only way to add pictures in your hubs is by using the photo capsule. You can add several pictures in one photo capsule or have several photo capsules containing one picture each.
For each image in the photo capsule, you can have it "full width", "half width" or "quarter width". For each photo capsule, you can choose the display style as either "with border", "no border" or "thumbnail".
Check out the HubPages learning center guide on the photo capsule for more information. Here's the link: https://hubpageshelp.com/content/Learning-Center-u... . Hope this helped.