Thank you all for your kind words and comments. Some of my answers below.
As mentioned, this portrait was commissioned to print full-color hologram. In this CG looking clean and sharp - smoothed out after printing. You can see it on video
For this work - the time allotted and the budget was not big. Therefore, I could not spend a lot of effort to create clothes. But still, I wanted to create the face with a good photo likeness. Unfortunately, for this, I had no photos with good quality.
The background for the Sheikh, my client wanted to see the national flag of UAE. But at the last moment, on the advice RabbitHoles, it was decided to refuse it. For more 3D effect in the hologram needed a horizontal saturated background details. As a result, for the background, we have added a photo of the mosque. This mosque was built after the death of Sheikh Zayed and is named in his honor. Inconsistency lighting on the face and the background was not so important.
The main reference picture, which was chosen by my client - below
More photos of Sheikh Zayed
A few test renders: