Hey TKG ! You're doing good and I think you're improving your work with each of your pictures. Some of them remind me the pictures I was making a few years ago, when I was trying to make fantasy worlds. All I can do is cheer you up, because working again and again on your 3D scenes is the best way to improve your skills. I've been making 3D for 15 years now, and I start to know when someone is on the good way.
I also see you're starting to use photoshop (or other) to add blur, effects, and to work on colors. It's a very good idea, so keep doing that ! Be careful not to add too much blur though, and not to saturate the colors. I know that in ASA I added quite too much effects sometimes.
Now, I'll be honest : there's still a lot of things you can improve. I believe I could give you the same advice than the ones I gave to Vengeance. I was explaining him a few tips after trying Shadows II, and I saw the same kind of issue in both of your works. There are some similitudes between your works. You're somehow doing the same "mistakes", and basically it's a matter of textures scale, and 3D objects scale.
Look, I had shared this with V66 :
1 - Texture size.
In your work, the textures need to be reworked. Most of the time, you use a repetitive pattern. It's either some wood on a table, or either some stones on a wall. Your first mistake is when your textures have a bad size. When you have a crack in a rock that is too big, it doesn't seem natural. Idem if the stones of a wall are much bigger than they should. And the same again if the joints between the stones are larger than a hero's head. I exagerate, but it's to explain the main idea. So you need to resize your texture to make it fit the view.
Then your second issue with the textures is when they repeat too much. It's not beautiful to look at, when you see the same detail of a pattern again and again and again. In the same idea, a 3D object can be duplicated in a scene, but its texture should be changed.
2 - global scale.
This rejoins the 1st part. When some elements of your scene are not correctly sized, it seems unnatural too. It can be a texture (stones too big on the wall), or a 3D object (a table with strange proportions). So, in your 3D software, take an object as reference, and rescale the others so they don't seem disproportionate when everything is in the same scene.
If you need great textures, just register (it's free) on CGtextures.com and download them as much detailed and large as you can.
If you need 3D models, register (it's free) on Turbosquid.com, make a search, then sort the result by "lower price", and download the free models you want.
3 - harmonize your style
This is a difficult part : trying to make your style unique for each 3D object you create, in order to have a global environment that seems real, and in harmony. The best example I can see to explain is the following :
In your picture, you have both realistic textures AND unrealistic textures. The ceiling, near the lamp, seems to have a nice concrete texture (probably a photo), while the shields have a schematic texture ( a drawing with flat colors). They don't fit together ! If you choose to have photos as textures somewhere, then you must have photos everywhere. So the solution for your shield is : add some details of metal in the yellow cross and the red paint, using some photos, in order to make them look realistic.
I hope I helped. Please stay motivated, and try to work on this. Show us the next pictures and I'll keep telling you what you can change. Good luck !