Illustration work is personal, time-intensive, and often commissioned with unclear boundaries. Many illustrators rely on PayPal invoices or informal agreements, which offer little protection when projects change. Tympi gives illustrators control by supporting milestone-based billing, such as 50% upfront and 50% on delivery. Each commission can be broken into stages, sketches, revisions, final artwork, with time tracked at every step. Compared to PayPal, which only facilitates payment, Tympi enforces professional terms and provides clarity for both artist and client. Invoices clearly reflect progress and expectations, reducing disputes and late payments. Tympi helps illustrators protect their creative labor and establish themselves as professionals, not just artists for hire.