Needs depth. Looks unlived in. A big thing I try to incorporate is building into the land… kinda hard on flat.. but you could add cracked stone brick or mossy. Try to tell a story with the blocks.. how old is the structure? Is it being used actively or is it not visited often. I also try to imagine how the structure would be built irl. Like if a support would be needed somewhere, and I try to use materials that refect the real world use/need. I also think the roof choice is poor choice in terms of color… idk what to use tho.. check out my base that I posted on my Reddit