This was painted a long time ago, but I don't know if it was put on the tumblr. It's Ptolemy after he went to the other place and Penrenuetet transforming into Ptolemy.
It seems that Penrenuetet was with Ptolemy when Bartimaeus was on his expedition, so I think he was actually in the most entourage-like position. There was also a description of him transforming into Ptolemy and acting as a decoy.
This illustration I drew for a fan event in Japan next year.
I usually draw Ptolemy’s hairstyle as curly, so it’s rare for me to draw Bartimaeus in this style. This is the style of the graphic novel version.