Looks really good, I particularly like his winter uniform (I presume it is based on the one he wore at the Washita?) Surprised he is not wearing his buckskin and white/grey hat for his regular uniform but then again this before the Little Bighorn.
A little off topic but I always found it a bit odd that the Seventh did not take their sabres with them into battle (save for at least one officer), most notably at the Little Bighorn, although then again the Seventh were trained in more of a dragoon role and I doubt swords would have made a great deal of difference, not to mention that most of the Indians had guns, many of which had a higher rate of fire than the Seventh's Carbines. I am not sure if they had them with them at the Washita.