Impactful images, simple, direct copy, and a single, clear call to action are critical for designing a successful landing page that drives conversions. Some sort of testimonial, review, or statistic is also helpful. This example is a landing page I designed for an executive car service company which differentiates itself from competitors with the features listed on the table.
The button at the top of the page gives customers a chance to schedule a ride quickly. When designing a landing page, I avoid inconsistent branding, text-heavy paragraphs, slow loading pages, poor overall design hierarchy, and other issues which may detract from conversion.