Eyes much smaller after midface lift through a lower eye approach. Can anything be done to fix this? (Photo)

I think you should consider waiting before acting on the eyes.  You should consider waiting 6 months after surgery before making conclusions about your surgery. Also, correct me if I'm wrong but on your previous pre op photos, I see a little scleral show, where a little white is showing below the iris along the lower lid. This is not a normal lid position aesthetically speaking. On the post op photo, I see no more scleral show, which is a normal appearance for most people. So he changed your abnormal appearing lower lid to a normal appearing lower lid position with his surgery. I know people are accustomed to seeing their faces a certain way and they often want it changed back to the way they are accustomed to seeing it, but take a look at it because in my opinion, he restored your lower lid anatomy to a normal appearance for most people. If the pre and post op photos are mixed up, or there are different views, then what I see could be different and my opinion could change.  Good luck and wait then reevaluate...look at the pics of magazine models eyelids...if anything, maybe he didn't explain to you the results of his surgery and caught you unprepared for the changes.

You are still really early after surgery. Canthoplasties and canthopexies always loosen up. They have to be made tighter in the beginning to account for this. Don't worry. 

First of all, 4 months postop following a lateral canthoplasty and midfacelift is still early.  Both of these procedures can alter the position and tightness of the lower lid (which is why they are likely being performed).  But at this stage, there is still much edema (swelling) that exists and therefore it will be more difficult to evaluate the "final" result.  While massage of this region may help, I would recommend a visit to your Cosmetic Surgeon to review expectations and timeframes.