How to search for oculoplastic surgeons in Europe ?

 On rare occasions, a unilateral blepharoplasty can be performed. A full set of photographs  and an in-person examination are required to make that determination

In your case I recommend a personal review from a PS with an interest in oculoplastic surgery. It is impossible to make an accurate diagnosis from the image alone, and a careful assessment in person (with or without scans) is important. Good luck! 

The only natural way to improve hollowness is to gain weight which is not ideal. The best solution is likely filler injection. Fat injection is another option but less predictable. See link and video below.

Its really hard to make a judgment by the pictures you posted, but I would say that there is always something that can be done to make your eyes look less tired and more pleasing. I would recommend you going to see an oculoplastic surgeon in person to discuss options. Hope this helps.

Time is more powerful.  You need time for the eyelids to heal.  The mild steroid can atrophy the thin eyelid skin but a three day prescription is unlikely to be an issue.  It is also unlikely to do anything for the scar.  I don't recommend this.  Instead I recommend seeing an oculoplastic surg...

See an oculoplastic specialist for evaluation. Your right eye appears more bulging or the left eye appears more sunken (enophthalmos). There are various causes. Treatment depends on the cause. See video and link below too.