As for the door I would suggest you study modularity too to get the idea how game assets work. Overall door is ok but on top left and right it bumps out a lilttle bit due to its nature of design. that in later terms can cause issue when it will need to be fit into a wall. You can do two things either match the sides of ur…
Try to pull a bit more from real life reference. If you tend to stick more to other conceptual pieces, you'll generally be grounded by the same drawbacks that fall upon them. Go for less decoration and more for form with function. If there's insets, think about why they are there. Paneling/raised platform/utility junction/…
Good progress on your stuff, I wish i had this much time on my hands to pump work out :D . ok enough with nice coments :D time to tear things apart for you. I dont know why u want to hand paint on a curved floor pannel, if ur 3d artist made it up that way than i understand. But usually what i have learned so far is to plan…