There is not an easy way to do this. Hub Pages insists that all capsules either cover the entire width of the Hub, or it will allow you to reduce the size to one-half and push it to the right side. Thus, you cannot put two picture capsules side by side.
The only other option would be to create a file that contains the two pictures. If the pictures are about the same size, the easiest way is to open a PowerPoint presentation, select a blank page and put both pictures on the same page. Size them or crop as needed so that the pictures are the same size. You can then group the two items together while in PowerPoint and then export the combined pictures as a single file. You could then import the picture into a full width photo capsule. There are other programs such as Photoshop that would let you do the same thing. It might be possible in Word, just never tried it. Also, if you have a scanner, you could scan the two pictures at one time. This will only work if the pictures are the same size and there is no significant difference in contract
I have suggested that Hub Pages allow us to move picture capsules to the left side of the page, but no changes have been made.
I hope this helps you with your situation. If not, send me a private e-mail and I will try to explain it in more detail and perhaps include a few screen shots that may better explain it.