Logo not showing on invoice

I am not sure why the logo is not showing. I noticed it said to go to advanced options and change the options from the default images directory. I tried all of the choices but it didn’t work.

This is the header image I used: /home/jackof14/public_html/packnstackbins.ca/pack-n-stack-logo_green_horozontal_2/
50 width
10 margin

this is the styling:
.pdf_invoice_heading_table {
width: 50%;
}

.pdf_invoice_seller_buyer_table th {
font-weight: bold;
}
/* pdf_invoice_items_table */
.pdf_invoice_items_table {
padding: 1px;
}
.pdf_invoice_items_table th {
font-weight: bold;
border: 1px solid #F0F0F0;
}
.pdf_invoice_items_table td {
border: 1px solid #F0F0F0;
}
/* pdf_invoice_totals_table */
.pdf_invoice_totals_table {
padding: 5px;
}
.pdf_invoice_totals_table th {
width: 85%;
text-align: right;
}
.pdf_invoice_totals_table td {
width: 15%;
text-align: right;
border: 1px solid #F0F0F0;
}

And the only thing in advanced that is checked off, are the three options in general display options.

Please help!
Thanks,
Carrie