Hi Max,
Great work mate, all the basic elements are there and you've added some wonderful details on the cloak and the leather gerkin.
In the interests of providing you with some constructive feedback and help you improve, I think you can improve the overall quality of your painting by applying my contrast to your painting.
In general, I think your highlights could be higher and your shadows deeper.
This applies over the entire bust, but especially in those places where such extremes are justified. For example, the hair looks a bit monochromatic. It could be made to look a bit more life like if you applied some lighter highlights on the top of his head and applied some very thin lines of lighter colour to give his hair a bit more variety.
In regards to shadows, any part of the bust that is hidden under something else, and is therefore not exposed to direct sunlight from above, is almost certainly going to be a very dark, if not black colour. The silver Gondorian cloak clasps for example would look much better if the silver colour was contrasted by a darker black colour.
I would recommend you try using the Stop Sign Rule, developed by Shep Paine, as a guide to finding a pleasing balance between shadows and highlights and getting a realistic contrast.
Ultimately it comes down to what pleases you and what you feel looks right. Pushing the contrast to unnatural levels may not feel right at first, but it certainly makes your figures and busts "pop".
Good luck
