To add both picture & logo in your signature, upload your picture in the 'Avatar' option available in the 'Basic' tab.
Then head on to the 'Add-ons' tab & under the option 'Banner', upload your logo and adjust the size from 'Banner Width' to suit the look of your signature.
If you don't want to add the logo at the bottom of your signature, get a custom template designed from our design team as per your requirements. Reach out to us with 'Custom Template' request on firstname.lastname@example.org and our team will design & add the custom template for you in your account.
With our Pro yearly plans, we design the custom template for you at no additional cost.