Some insightful info already discussed here and additionally as others mentioned lighting can make or break a scene regardless of an intended art direction so I'd also suggest looking into photography techniques, for example 'Rembrandt Lighting' although the master himself was particularly influenced by the works of…
Hi, this is a good start! If you want to achieve realism I would highly recommend finding real life references that are interesting to you and trying to recreate them as closely as possible. In your image the door, wall, and floor are clearly just using one tiling material, and are lacking in detail. Where is the trim on…