Upfront downpayment before the job start. Absolutely no samples or tryouts for free. Rest of the payment as the job progresses. Watermarked, work-in-progress installments during execution. Clean, final artwork after payment is completed. A couple modifications on the ongoing project are allowed, as long as it abides by the original linings.
Image references for the job welcome. I prefer to communicate by e-mail. I like to rest during weekends.