The beautiful thing about working with clients over the web is that there are no official hours of operation for me. I agree to deadlines I can meet and keep my clients updated regularly with the process as I move forward, the amount of updates depending on their preferences. I do prefer receiving payment via PayPal, but can be flexible.
Concerning revisions: There are many types of illustration jobs, and many of those jobs involve a process of revisions and communication between the client and myself. I'm aware of that, and I am as amicable and easy to work with as possible. Eliminating my ego from the equation is essential, and I do my best to use my skill-set to produce the vision my clients are hoping for. In certain situations I do need to take steps to protect myself, however. If I am working on a small job for less pay than I am accustomed to, I do need to retain more independence in the design and decision-making process. After assessing a potential job and before accepting it, I will agree to a set of terms with my client, so that neither of us feels surprised or uncomfortable by the direction the project goes.
Ultimately, my goal is to provide a satisfying, timely and professional set of work to clients, with little or no surprises.