Even white or bright yellow might help
I agree it does feel very dark, maybe bringing your highlights up might help give the model a bit more contrast, like you've done on the sleeves. The skin looks pretty good but i feel the metallics are a little flat, maybe applying some glazes of darker colours to create darker shades may give some objects such as the blade a brighter colour. The use of a lighter tartan colour as Bren suggested would probably work.
The beard i think should be a focal point on the mini and personally i love bright vibrant colours so i would try and get some areas of the beard up to almost a white shine.