This looks a lot more like the conventional depiction of a warrior of the Eorlingas than your color paintings. But then it could be explained as a Rider from the time of Eorl, or perhaps some ranker from the outlying areas who doesn't get access to Theoden's armory filled with Gindirian armor? The bachatraz-style mail is a nice touch. as is the gutterpipe-style bracers & greaves. Also like that he has a bye-knife as well as a scramseax for close work. A-a-and he has a belt pouch!
I wasn't aiming for one specific look. I'm sure the rohirrim would have dressed in various types of armour and clothing. Those living closer to Gondor would probably been more influenced by Gondorian styles. Plate armour being very expensive would end up in the hands of the very wealthy and powerful. Everyone else would make do with what they could afford. In the charge scene I showed a variety styles to make a point about individuality and not stereotypes or iconic looks. So this man could easily be from the same time period and fit in just as easily.
That's a fair answer. I have to salute you on that one, since the idea of uniformity in equipment and dress didn't really catch on until the mid-17th century. So no five Riders ideally should look the same, due to matters of taste and budget. I suppose it's a matter of "similar" as opposed to "the same"? The LOTR movies of course had to cheat some for the sake of the production staff, although they did have some variety. I did notice that some of the background riders in the charge painting had differing armors.