Everyone improve- and that's why we have PMC site. Believe in yourself! If you are fresh to the site, you surely have fresh ideas nobody tried yet. So, hit us with your style! That's your advancement you can and should use.
As you said, themed texture pack make a big part, because that's the building style. Ayway, I like the building, you used many different materials and make minimalistic, roman temple. Diamond to give encouragement to build something bigger with same amount of details! (maybe you have something prepared yet- going to look your other creations)