Lemme start this by saying I'm going off the video, and not trying to be offensive, just trying to help. I'm also an amateur, but speak from experience. the wooden workbenches are a perfect example of the consistent lighting comment, having the highlight on the wall side as if there were a bright light in the wall. it completely breaks the realism of that workbench being in a room with the light on the other side. everything should be lit from the top but not brightly. there shouldn't be any hard highlights or shadows from any direction other than the sun from a fixed position above on any texture, and at the same brightness. some walls have hard deep shadows and others do not(should not). overall it's like a collage of stickers from different magazines over a different shiny magazine page. not objects in a world. each image you have used has depth in itself, but is completely disconnected from the space it's in (the ship chunks are legit). one trick I used was the burn tool at about 20% around the edges and blended it to 85% transparency, might work for things like the trees so they don't have an obvious border and feel more like part of the environment (or to give items/furniture less of a hard edge)... but it won't fix the fact that some of them have shadows from the wrong direction on the leaves as an example. some of your source textures also appear to be different resolutions, the floors being a great example. (some don't tile well either) Again..not trying to be too harsh, or discourage you, I'd like to see this be awesome and everything fit as well as those ship chunks one day. 