Hey! Great illustration! Just a few small adjustments could help improve it. First of all, the dark background is excellent :D The "light over dark" contrast is very clear. However, I would reduce the saturation of the colors a bit to create a better contrast with the hand and the butterfly. The hand feels a bit dull and pale. It could use some more orange-reddish tones so the skin color reads more clearly (remember that there is blood beneath the skin, which is why we see those tones in certain areas of the body), particularly in the fingers. This creates what is known as "subsurface scattering". In simple terms, light penetrates a translucent surface, like skin, producing a subtle glowing effect. Lastly, I would add a small glow around the butterfly to help it stand out more. Hope this helps!
