Why do I have a sad look after having an upper lower eye lift surgery? (Photo)

I don't think your eyes look sad.  that can happen if the lateral corner has been moved down, but your corner looks fine.  Do you think you look sad??  Never good idea to listen to other's comments.  

Eyes can look "sad" after eyelid surgery if the lower lid sags a bit.  I do not see that in the photographs provided.

Sorry but the posted photo appear very similar to me over the internet. Best to seek in person opinions and answers... 

You appear to have a slight amount of lower lid laxity or lack of horizontal tension of your lower lids.  You may want to wait or have the lower lids tightened by your surgeon. I would suggest you discuss this condition with your surgeon for the best opinion.

Eyelid surgery provides a larger "wide eye" look. There is a slight rounding of the lower eyelid that can be appreciated on your photos. This may be causing the sad eye look your speaking of.