To answer your question directly I'd say "no". This version is lovely. You already have a form of "color minimization" around brown/ orange tones - which gives a pleasing effect. I don't think you need any further reduction.
Very cool image. Beautiful detail in the moth. Just a thought: This looks like 4x5 aspect ratio - I'd like to see a 2x3 aspect ratio version of this that has a little more room for the eye to travel on the right.