Firstly - I want to draw you something someday ! I know my art does not look very nice, but I think that if one loves John, they have to be a good person! It is a gift.
Second, what are your commission prices? If you have examples for the types, that would be nice - like how much would something like the picture you just did with John and Jenny cost?
すいません訂正します。
「こういった場合の例をお持ちなら、いいだろうでしょうね」
→「こういった場合の見本があれば有難いです」