If those green swirly things are supposed to be glowing, then treat them like a light source and light your scene with their influence. Right now, the green swirls are the only visible light source that’s significant in the scene besides that white glow above his finger. So depending on whether there are light sources off-camera, that green swirl should have a lot more influence as a light source (which will also help make your image more interesting in terms of lighting).
His legs are on the short side–not sure if that’s what you intended. Usually, when legs are shorter than the torso, the person will appear short/squat. This is why artists generally make sure the legs are at least as long as the torso, and ideally longer, unless they want the person to appear short.