Upper blepharoplasty. Left incision not the crease. Why did he put the incision higher w/ the more sagging lid? (photo)

That is not an excuse because with awareness, the surgeon should be able to compensate for their handedness.  However, it is very common to see a right handed eyelid surgery have a little trouble making a symmetric incision on the left side and vice versa.  The good news is that often this small difference does not matter because the two creases look they tuck under the fold and are mostly not visible.  This is extremely early from eyelid surgery.  Please let yourself heal and consider reposting here at 6 to 8 weeks after healing more assuming that you still having a concern. 

I would not be too worried. Usually the scars from the upper eyelid bleph. will be so inconspicuous that you hardly can see it. The only thing is that you have to wait for 3 to 6 months. I can tell that you will be happy with the results. 

Until the swelling in the right upper eyelid has receded, I do not think you can come to any conclusion as to where the incision was placed. The swelling could skew perception of where the scar will ultimately be.  Milia are quite common after surgery and can easily be addressed.  Discuss your concerns with your plastic surgeon. Best wishes. Dr. Kraft