How to write a cold-email

Good article, and thanks for the share. I write a lot of cold emails, and everytime I compose a new one, I wonder how to write it better. Though, I've been writing cold emails a bit more like 8-10 sentences...

I wonder what thoughts are there about including some "extras" below the signature? That is, I'll include some pictures of my company's app or some testimonials below my signature to potentially help with intriguing the reader. And I start with pictures because pictures are naturally more engaging than words.

Any thoughts??