I've added an image verification feature to the message forms.
This is used to prevent automated spamming of your contact forms. While we don't see much of this, as you can disable non-member messages (which is where most of these would come through), it is an extra measure that should help to verify the legitimacy of messages coming through your MuseCube contact form.
I'm considering that also. At this point, portfolios without images are really restricted in what they can do anyway.
This particular feature is the text / image verification field on the contact forms. I'll probably be making some adjustments to this function soon, so that existing, verified members won't have to go through this step when sending messages.