The option to add a logo on the invoice through QuickBooks application is a great idea however, it isn't available. With that said, I'll personally share this feature suggestion with our developers. They'll analyze your idea and may be added to one of QuickBooks update.
On other hand, what we can do on the sales form are adding a message, entering to whom you'd want to send a copy of the transaction, and including it as A PDF attachment.
I've also adding this article on how to send an invoice through your app: Send an invoice. You can see this option under the Send your invoices directly from QuickBooks.
I'm just here if you still need my help in sending a sales transaction.
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