Minor Commissions

[paradedemon.livejournal.com]

I'm currently a minor and I'm wanting to take Fursuit partial commissions.
I've noticed most people tend to not commission minors because of the legal contract issue.

Are there any ways I could show I really do want to be professional about this and complete commissions?
I want people to trust I will complete their partial in reasonable time at a good quality for the price (I've been thinking 250-300$ ) and I won't scam them
 
I was thinking to send WIPs at set intervals but I don't think that would really be enough?

(btw, if I've done anything wrong, please tell me, I'm fairly new to AB)