I'm using Houdini apprentice, and it seems that it ignores the resolution I set the camera to. If I set the camera to 1920x1080, I get 1280x720. I've tried other settings but the resolution will not go higher. I've also tried overriding the camera resolution in the render node and increasing it that way, still no luck.

Any idea how to produce higher quality renders?

Renders in Houdini Apprentice are limited to a maximum resolution of 1280x720. You can find more information on the limitations in Houdini Apprentice at https://www.sidefx.com/filmtv/compare/ [sidefx.com]

Thanks for letting me know. It's appreciated.