In the email tokens, I see the facebook and linked-in lead photo URL tokens. But if I send an email to a client, I would want to put a photo of the account rep (lead owner) in the closing. Not a picture of the lead receiving the email. I think it would be a nice personalization to the email. Unfortunately, I do not see a way to accomplish this. Any way to use the SFDC contact owner photo in an email?
You could create a snippet with the uploaded image of the lead owner and make the email dynamic.
There were some threads on this if you look up Lead Owner photo or signatures.
The other way may be to do Steps 1,2, then create a SFDC Lead/Contact field that syncs to Marketo, upload the URLs there and make it Dynamic based on Lead Owner (within Apex code on SFDC). Requires some amount of maintenance.
There are steps I'm sure I missed, but that's the idea.
If there are no pictures available for dynamic content, is it possible to use placeholder images?
Yes, for instance if we have an account that doesn't have a rep assigned yet, it would just come from our Customer Care team with our logo where the headshot would normally be
You could also do it through a velocity token (my personal preference), this method gives more flexibility in defining the logic; also I am just not a big fan of creating segmentations when I don't have to.
Here is more on this topic Velocity script tokens as an alternative for dynamic content