I responded to your other thread, I’m not sure why you started another one… Anyways what I would add is foliage and a bit better materials. Indoor/ outdoor archviz is kinda difficult and takes a lot of practice, but you can make it work with experience. Here is one I did recently:
It took a while and in my opinion the results are so-so, and It took me about six tries with different scenes to get there. For a beginner like yourself, I would stick to the interior and really get to learn the dynamics of working with unreal, then perhaps later move on outside…