Hi,
I am capable of designing helmet renders for your website in different colors and with tweaks like you mentioned. Please do contact me back so we can discuss further.
Portfolio can be checked at:-
https://www.freelancer.com/u/inderar88
I have great experience in 3ds max,Z-brush,Maya,Photoshop, Solidworks & vray programs.
My 3D field skills are Modelling,Texturing,Rendering and Animation.
Regards