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Figured it out with CSS…

Hope this helps anyone using Mystique theme requiring an easy fix to have different header images on certain pages..

Go to.. Appearance – Mystique Settings – CSS.

Enter The Following:

.page-id-1471 #header {
background: url(https://www.ENTER YOUR IMAGE URL HERE.jpg) no-repeat scroll center center transparent;
}

Please note.. 1471 is my page ID – Insert the page ID of YOUR page you would like a different image.

Slight correction to the CSS code I am currently using.
/* Alternate header image */
#page{background-image:url(https://localhost/wpcontent/themes/mystique/images/_alt/header2.jpg);}