You can access the image URLs in a Twilio MMS message by using either the MediaUrl properties when receiving a webhook request or by accessing the REST API to fetch the Message Resource and build the media URL manually. The former is typically used for initial message reception, while the latter provides more flexibility but requires more work. To achieve this with Python, you can install the Twilio library, create a Flask application that handles incoming messages, and use ngrok to tunnel your local machine's port to a custom forwarding URL, allowing you to test your app without deploying code. The image URLs are stored in the Media resource's uri property, which needs to be stripped off the '.json' extension before being used. With this information, you can access and manipulate the images sent to your Twilio phone number, potentially displaying them on a web page or performing further analysis.