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As one of the other comments has already touched on. You did not actually test smiling faces vs non-smiling faces as both the landing pages are very different in more than just one element.

Also, from my experience your industry to better suited to different types of tests such as the value proposition and the selling of the benefits rather than the features of your product.

Answer the visitors need/desire and they will sign up

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I run a Conversion Rate Optimisation Agency and would be happy to help you design a new landing page to test as part of a free consultancy, in return for a review/testimonial of our work.

Let me know if interested.