Hard palate graft vs lower eyelid retraction. What are the most common complications can occur? (photo)

Simply placing a hard palate graft to reconstruct the lower eyelid should lengthen the eyelid and impove its position on the globe.  However, It will not recruit skin and soft tissue into the eyelid.  This means that despite the surgical work, the weight of the cheek will continue to work against the position of the lower eyelid.  That is why I developed the additional step of placing a rim implant as a felting material to support the weight of the cheek.  The key is finding the right surgery so you do not have to go through this surgery more than once.

I need to examine your eyes but I disagree with only placing an internal spacer graft because your skin also appears short and hence soof/midface lift is needed to bring up necessary skin. The type of internal spacer graft is actually less important as I have recently published on this topic. You can find manuscript here. Also see my website and click on "Eyelid Retraction" page for more details. Skype consult available.

Thank you for your question and photo.
The use of hard palate grafts for lower eyelid retraction repair is a well-established technique. The hard palate offers a rigid support for the lower eyelid and is used to lengthen the middle and posterior lamella. The fact that it has a mucosal surface helps to keep your eye comfortable. 
In most cases, a small amount of the graft contracts, but the hard palate will not usually completely resorb--this is a long lasting intervention in most cases.
Best of luck!