Hey there! I appreciate you looking for further feedback & suggestions here on the Roblox Developer Forum. In addition to the great suggestions above, I’d say try going for a more realistic look since I feel it’d give a more vibrant look because we all want our players to vibe when in game. Have a go at using a variation of materials such as Brick etc too!
As @colbert2677 has already mentioned, this isn’t exactly low poly. Although, if you would like to get into more low-poly based building here are some wonderful resources to take a look at!