My thoughts are as follows
Reduce the number of colors. I typically use 3 main colors on my models at most. I am not saying you can't use more, but sometimes too many colors can be distracting.
On this one I see 6 colors that are vying for the eyes attention. What is helpful if you need more colord are to use more neutral colors so as not to compete. In this model, the red is the predominant color, but the blue on the gem AND the tassel AND the cloak along with the gold helmet and the silver chain AND the bone color all make it look very busy.
Also, there does not seem to be much in the way of shading or highlight from the picture. some simple lines in the creases of the armor would go a long way to add definition to the model.
Another thing is metallics need to be shaded. The gold and the silver look kind of flat. A quick wash usually does the trick pretty easily.
its not all negative comments, the one thing I do notice is all the painting is very neat and clean, not sloppy. I think really a little more knowledge of using colors and your ability to convey what you visualize in your mind what you want in your models will become more apparent.