For me, parent's design definitely feels more premium than the original, which to me seems a bit amateurish.

Here are my observations:

* Layout is too wide. Parent has made it more narrow which feels more natural to me.

* Form inputs are too wide. Same thing as above.

* Weird color palette. I like parent's color simplicity. Notice how he has used different shades of the same color.

* Too random images. IMO the images used for the hero and pricing sections don't make any connection with the product. Parent has left out these images and it is much nicer.

Takeaway, prefer simplicity if you're not good at design.

I tried to also improve the line height, make the headings and subtitles simpler, and align some elements that weren't on a grid. I think you could benefit by having a designer friend look it over for you.