In your own view, add this XML and place it before the IMAGE field:

<div class="alert oe_edit_only alert-success text-center o_form_header" 
     attrs="{'invisible': [('customer','=',False)]}">
    <div name="avatar2" class="text-left">
        <b>Please follow these intructions when creating a New Customer:</b><br></br><br></br>             
        ▪ Remember to do this thing, but not this other thing<br></br>
        ▪ Don't forget to do this thing, and this other thing<br></br>             
        ▪ If you are still confused, please open a ticket with the Helpdesk.
    </div>
</div> 

(the oe_edit_only attribute in the class tag and the invisible property in the attrs tag determine when to show and hide this text)

It will look like this when the Form is in EDIT MODE (Customer = TRUE):

It will look like this when the FORM is in VIEW MODE (Customer = TRUE; Customer = FALSE):

It will look like this when creating a Vendor (Customer = FALSE)