Careful with the stickers, as some of their adhesive can damage the helmet and reduce its effectiveness. They are fine on the peak but not on the main shell
Get a professional painter with the correct airbrush kit. More expensive than stickers but how valuable is your head? (some more valuable than others !)
I tested a helmet against a concrete pylon at over 115mph (the door post did not absorb much energy)…and am glad it was effective. Would hate to think what the consequences would be with a bad / cracked / brittle shelled helmet.
Watch putting a name or graphics on your helmet with paint I got nabbed at he C.O.I Scrut 2 years with a tool of a sructaneer looking for me to take it off cause he came up with some bull that if you were in a accident and ended up a vegitable you couldnt sue Sparco not that yould be in a shape to anyway!!!!!!!!!!! , had to take me name and blood group of the helmet and prsent to him before the rally started that sat morning