any comments and sugestions
Re: comments…
I don’t think that this is www.simulacrum.de worthy. 
anyhow, I’d recommend you get rid of that HDRI and the distracting trumpets, fix the wood texture, add appropriate fillets to the model. the head model does not quite relate to jamiroquai. So instead of putting in these models to fill your rendering, it’s better to focus on good lighting and modeling first.