That depends on which kind of logo you would like to add: watermark, logo in header, logo in footer.
With watermark you have not much flexibility - it appears on each page. With headers-footers there are different ways to control it. See:
html-pdf-faq-f1/pdf-page-headers-footers-definition-options-t41.htmlhtml-pdf-faq-f1/is-it-possible-to-set-header-footer-scope-via-the-api-t176.htmlAlso if you need the image at the bottom part of the first page,
<pd4ml:footnote> may also help:
<pd4ml:footnote noref=true><hr><img src="..."></pd4ml:footnote>