Hi, I love your style and work, and would like to know if you're available for commission?
I truly appreciate your interest in my work and the opportunity to collaborate. However, I regret to inform you that I am unable to accept your commission at this time. My current schedule does not allow me the time necessary to dedicate to your project, and I am also inexperienced in working with styles other than my own. I apologize for any inconvenience this may cause, and I hope you understand. Thank you for considering me.