the first thing i notice about ur warrior painting is that everything is almost smack down in the middle. The moon, the warrior, the fire, the blood (i think its blood) on the ground.
Although there's nothing wrong with that, it might be interesting to play with the positioning of all the elements on ur painting (assuming they are on separate layers) and explore the use of the canvas rather than keeping its elements in aforesaid linear position.
Having said that, at the end of the day it is your painting and whats important is that YOU are happy. There are popular "guidelines" about composition but by no means are they hard and fast rules to adhere to. There is the common practice of dividing the canvas into thirds for which there is a quick tutorial here
Other than that i think its looking fantastic.
