For a concept, you’re looking for the general composition, lighting, and mood of atmosphere. Texture not so much, it can be flat even, and you can tell if the composition/lighting can work or not. Putting in some form of atmosphere with soft brushes will help too, and doing this all in grayscale value first if you can’t get it looking the way you in color from the beginning.
I usually tell my students to take about 5 mins each for grayscale thumbnails at 1000px for ideas, then take half of those and develop color thumbnails from those, spending about 20 mins each, then choose one of the explored colored thumbnails that is the strongest to be developed into a matte.
Regarding your monitor problem, it might not just be the color profile, it could be the monitor quality itself. Some monitors aren’t sRGB native, and try to show Adobe RGB range, which is more saturated and higher in contrast in some cases. True sRGB monitor will show a good curve and be consistent, especially nice IPS class monitors (such as the old Cinema Display 30" from Apple) and the ones that can be calibrated correctly (like the Dell 30" Ultrasharp 3011).