Dont be to low on your prices, its much harder to start raising the orices after a little while than to charge a bit more from the beginning.
But I understand that you didnt want to charge him too much if he is able to get you more work, I do that as well, but I'm carefull to point out to the customer that he gets a good price because he gets me more customers.
The car looks great and for a detailing work like that on a big truck like that and considering that its black I would charge him 500€ only for the paint, not any of the interior.
You have good talents and I hope you get a good reputation for beeing good, not low price works!
