The Xel’naga Charged Crystals summoned by Zeratul’s Avatar of Form have misaligned textures on their portrait in comparison to those summoned by NPC constructs. The placement of the texture on the face is offset towards the center; the face now appears compressed towards the central line. The space in the center of the head has shrunk; the eyes and the symbols above the eyes are now crammed so close together as to be almost touching. This seems like a definite texture error, and it would be good if the textures could be fixed to match the default Xel’naga Charged Crystal portrait.
The disparity between the two portraits can be seen on the Starcraft Wiki on the page “Xel’naga Charged Crystal”. By switching between the portraits of the two versions of the unit, the issue with Zeratul’s version of the portrait can be clearly seen.