As a human, I have to ask: was your friend wearing full riding gear? (good helmet, correct jacket and pants, appropriate gloves and sturdy boots) Was there another vehicle involved? (95% of all motorcycle accidents involve another vehicle)
I like the artwork, and I even like the concept your trying to convey. But not all that keen on the skull-in-helmet imagery. The point of wearing a good helmet is to protect the noggin in an accident. And your friend was hurt, not killed.
And if your friend fell off their 'steed and another vehicle wasn't involved, let me gently say that more folks get hurt - and get hurt just as badly - while skiing. (search for "Schumacher" and "skiing")
And I'll end by noting that many more people wind up in the emergency room for an injured that resulted from taking a morning shower than from riding a motorcycle. (statistically speaking, or so says the American Insurance Institute )
Hope your friend's ok. Tell then to keep the rubber side down...