Hey, yes I did, it's this masterpost of sorts for physical descriptions of Sultanate of Women members, for reference.

Mustafa as a young kid of 4-5 years old was noted to have been thusly:

“[…] et nel ritorno a casa essendomi accostato al serraglio del Gran Signore in tempo che si ritrovava al chiosco la Regina madre con le donne, hebbi occasione di vedere il fratello di Sua Maestà che viene nodrito, come innocente pecorella, per dover fra poco tempo andar al macello, et demostra bellissima facie.” — Venetian ambassadorial dispatch dated September 18, 1604

Translation: “And upon my return home, having approached the Grand Signor’s seraglio at the very moment the Queen Mother and her ladies were gathered at the kiosk, I had the opportunity to behold His Majesty’s brother—who is being nurtured, like an innocent little lamb, destined to be led to the slaughterhouse in a short while—he [Mustafa] displayed a face of surpassing beauty.”

Of course, at this time it was believed that Mustafa being so young (born around 1600) couldn't have been a threat and Ahmed apparently wanted to cherish him like a son. Yet, him being in imminent danger was very much expected as soon as Ahmed fathered viable heirs of his own.

The featured 19th-century co-enthronement icon belongs to the so-called non-canonical icons that are quite common in Russian iconography. However, there are debates about what “canons” mean and how they should be regulated. Jesus as a lamb, St. Christopher with a dog head, and the depiction of God the Father are examples of divergence from “normality.” The phenomenon can be explained by the fact that icon painting traditions have been developing over centuries under the influence of different monastic and ascetic practices.

The day many Albionites were expecting. The Enthronement of the new king. Crown Prince Arthur is to be crowned in the Halls of Albion. 

First to arrive is the Crown Princes’ children, lead by Princess Mary Elizabeth.

She and her sister are wearing the Pearl Tiara and matching necklace. However, the Princess Mary is also wearing the Crown Princess Brooch, as a nod to her being the future Crown Princess and Queen of Albion

Next we have the Princess Victoria Esme 

Like her sister, she is wearing the Pearl Tiara, a copy that was made for the Princess before the enthronement ceremony. She paired the tiara with pearl earrings and necklace. 

Walking just behind her, is Prince Arthur.

The dapper young Prince wore a black suit to the ceremony.