Thank you so much for putting effort into giving so much helpful feedback! I actually did try removing some of the outlines, but I didn't like the immediate result and didn't do anything to flesh it out. Also, I considered making people, but decided against it, and, as said in my description, I tried a bush but it didn't really look so great. Thanks for your advice- I'll probably continue working on this and update when I'm ready!

 RoboBOT totally NAILED it! Great advice!

Thank you so much for giving your building some character! I love the dingy, worn out look. The colors are really nice as well. Something to consider is removing the solid outlines. Outlines are fine if that's what you like, but the best iso pieces I've seen lack outlines. As for design, think like an architect! For ideas, google skyscrapers, palaces, castles, museums, and other buildings that have more going on than the average office building. Also, you can think beyond just buildings and include a lot going on in your scenes. This is a great start in iso, tho!