You captured his expression so amazingly

I dig the brush work a ton, This is unmistakably Jerma. Keep up awesome texture work like this

I think you have a good start on painting here. You already seem to have a grasp of one of the fundamental rules of painting: paint the colors you see, not the colors it's "supposed" to be (for example, you know an apple is red, but in the right lighting it can be orange, purple, or even green or blue). Just fill the gaps in between where you apply colors, and maybe find a way to group more of the colors together to give a better sense of 3D form. Either way, good start!