Due to the content of some commissions, using a website contact form will drop your email into my spam folder, so it has to be done manually. At thos point, a simple email will be appropiate, with a quick description of what you want and with which characters. Also, it's good to mention as to who you want creating your image as we have three very different styles.
If you have reference images already obtained, add those too. Normally, a typical reference email will contain a few character images, and a few pose reference images (normally porn pics of some kind). Whereas a quick email sets things up, the more you can pack in regarding your idea the better. When you're ready, email using the address below or tap the "Email Me At" link to open your chosen Email app or service directly.