I rate this Captura: AikErection/10
Proper rating: 5/10
Your shots are okay, but don't be ashamed! We all had to start somewhere, and it's only with practice and experience that we get better, I'll try and give a few tips, coming from someone who has spent a LOT of time in Captura:
Reduce your FoV to 0 in the Captura Settings, this marginally increases detail and is a staple as to why lots of people's Captura's can come out looking extremely good.
Play with exposure and lighting. It seems that you're using the scene lights and 3-Way Lighting. (ALWAYS use the 3-Way lighting, it helps a lot. Trust me.)
Play around with filters, filter opacity, and filter depth. But there should almost never be a case where you're using a full opacity filter, around half or a bit less is 90% of the time: Always better.
am dum-dum so I can't remember anything else. But I hope this helps :)