I think that in Send New Message, Must be removed, Subject, I do not think it is necessary in a private message
Example, you want to write to your girl, In the evening I want to go out for coffee, What should I write as Subject, and why I have to write it
And another problem is, or attachment of a photo to the message, is not feasible
Attached Images
In context of professional exchange this field is more as useful, it is even essential it allows you to have different discussions with the same interlocutor.
What would be good would be to not make it mandatory, if people dont write anything, we can send the message anyway., it's simple and not hard to do.
For your girl GeorgiosT it's better to send him sms to go out