After orbital decompression surgery, my right eye has sunken downward in sinus. Does orbital implant surgery work in this case?

it appears that you have eyelid retraction along with orbital proptosis from your primary picture. I am not sure if your right orbit has displaced downward or still this is the Right Upper Lid retraction that gives the impression of orbit disposition. You need to have a complete examination of your eye to determine this.   

A sunken eye in the sinus after orbital decompression, can be corrected with orbital implant.  You need an experienced oculoplastic surgeon for this procedure.  In your photo, you have a very strong upper eyelid retraction that can also be corrected.  Good luck !