[Starting to get the hang of this]

Been working on a few models recently and I'm quite happy at how they're turning out. Still got a long way to go but I'm getting there. I can finally model, retopologize, make a uv set and paint it. Took a while before I was able to get the hang of retopology but I think I've finally sussed it. Still not perfect and there's a few errors, I think the problem is with baking the textures. 

Here's what I've been doing.

The microscope is the first time I have used all the rooms in 3D coat to make a complete model. The sniper I have just finished and plan on modeling a scope for. The flintlock pistol is a w.i.p that I started about an hour ago. Going to start adding details soon.

https://sketchfab.com/lionclaw0612 That's my sketchfab page so you can take a closer look. I'm open to criticism and would like to know where I could improve on. I reckon I need to focus more on detailing, esspecally when it comes to texturing. What do you think?  

  

[First gun]

This model of a cz75 pistol is one of my first models I have made in 3d coat. I don't think it turned out that bad, the texturing could do some work though. Anyone have any ideas on how I could improve it? 

[My first model]

This is my first model I have made using 3d coat, I've only had it for a few days so I still have a lot to learn. What do you think and how could I improve?

[How to make a scene]

Thanks, but what would I do if I wanted to make the object look like its sitting on the ground?

[How to make a scene]

I've been using this software for a few days and have made a few models. I am wondering how to display one of my models against a background to take a screenshot. How would I do this, do I need a different program?