first off that duplicate needs to go. Doesn't suit the signature and severely disrupts any attempted flow. It also looks very cut and doesn't blend in very well.
Colours look pretty washed out imo, too pale. Try get some more vibrant colours.
That green c4d on the left looks 'awkward.' I don't think it suits the colour scheme and it being really the only green it just stands out way too much and doesn't blend.
After you get rid of the dupe I'd start to burn and dodge a bit more to get some better lighting. Speaking of lighting just to the right of the focal's head, there is a very bright and strong light. Try to tone that down because it is far too strong IMO
Blending of the render looks pretty sweet and the only problem I see is those circles.
KIU