And here is my sketch of the visiting angels
Piero della Francesco
B 1416 D 1492
On loan from the National Gallery, London
This was most probably his last work and it might be unfinished at that. Also, some damage may have occurred during a cleaning in the 19th century.
Here places Jesus in humble surroundings and includes both a landscape and cityscape in the back ground. It sits in great contrast to Lorenzo Monaco's Adoration of the Magi in 1422, where opulence was the order of the day.
This painting was completed decades later and you can a new style emerging.
Here is a wonderful write up on this painting