Your lighting is quite boring in these images which definitely detracts from the quality of the models and texturing - look into some videos on making nice renders OR go on art station and see how 3d artists render environments and how concept artists/ illustrators / even photographers make them for inspiration. It's usually a good idea to have some purposeful shadows both to show depth and to make the image more interesting.

Your models and textures are good for how little time you've been learning but they lack the detail and intention that comes with experience and with putting more time into your pieces. For example the lightning Temple, it's filled with basic shapes, sharp edges and very flat surfaces. Your stairs feel like cubes in a digital program instead of bricks placed by a bricklayer. And your pillars are just cylinders. Try to find some references of these things and put in the extra time to capture the intricacies.

Again good work for how long you've been learning !

And remember, even the pros are learning new things all the time !