Every time you create a new design it adds to your portfolio, it show cases you as a designer. I embrace new and different custom work, it helps me grow as a designer. I have a formula of double- triple supplies and then 50% labor. With custom work I always get 50% down and then send pics of finished product before shipping. You have to create a formula that works for you, keeping in mind every time you make something new the first time it usually takes a little longer. All the best :)