How can I improve UE4 render quality to look like a high quality screen shot?

How can I improve UE4 render quality to look like a high quality screen shot? I tried everything that I know - scalability settings set to epic, high res material textures, LOD detail mode set to high, light quality: production, but still didn’t do the job. From the images below, one is from my scene in UE4, the other is taken using UE4 screenshot tool. I just want to increase the quality to look better. I’m not satisfied with what I have. Thank you.

I’m not sure what you are expecting from a high quality screenshot so it’s hard to tell what you can do to improve. Highresshot command only increases the resolution of the screenshot. If you want to have more realistic looking shots you’ll have to work on lighting and post process effects.