Advanced kits?

Hi all! I’ve recently done the Cathy’s Flower house kit from rolife and while I loved it, I wanted something more intricate and time consuming. I finished it over a weekend but I’m looking for something to last me. I’m willing to spend the money on a higher quality brand, but they seem hard to find. I’d love to hear about what kits you’ve done that you’ve found challenging (and time consuming)!!