A quick botframework tip – you can include images in your message attachments by Data URI, not just by URL!

For example, constructing a message like this:

var reply = message.CreateReply("Here's a **datauri image attachment**");
reply.Attachments = new List<Attachment> {
    new Attachment()
    {
        ContentUrl = "data:image/jpeg;base64,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",
        ContentType = "image/jpg",
        Name = "datauri"
    }
};

Gives a response that looks like this:

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