This is an awesome painting, I must say. I love it. Just one thing, though, I noticed that his gladius is on the right side of his balteus, when it should actually be on the left. The reason for this being is the fact that a centurio was a commissioned officer, and they were allowed to wear their sword on the left. Other than that, this is spectacular!
Hey, it's certainly still an incredible painting. And there's always room to say that not all centurions wore their gear in the field (such as on campaign, in battle, marching, etc.) according to regulation, but rather to their own personal preference, i.e. whatever they felt was more comfortable and advantageous. But it's always hard to know exactly what they wore because whatever primary documents still survive from the time period are somewhat vague in that sense.