I need some advice

Hi,

The model that you uploaded for free download is much better than all the paid ones.
This is perhaps the main issue at the moment.

Regards.

@jaguarbeastproduction Pardon my ignorance, but based on what and wich you think that you can judge someone elses work ? I'm struggling to find any work that is done by you here on cgt and outside of cgt. The only thing about your work is a 2 years old claim by you, here on the forum that you are preparing some new models and that old ones are removed for update and that's it, and how is that no one of the "big players" in the 3d community never heard of you? Besides empty profile with 30k rep points (wich can be grinded if you spend a lot of time commenting and liking), there is nothing else. Usually when someone here on the forum judge someone else's work he/she also have to prove competence via their own work. I'm not trying to be jerk, nor i'm trying to challenge you in any way, I'm asking just out of curiosity.

I like the vehicles. The weapons are ok too, but the Low Poly Revolver looks a bit cartoonish with the odd shaped trigger and handgrip.

It doesn't seem to me that you are doing a bad job, a little cold, perhaps, especially at the rendering level, in this sense, what I would say you need is more knowledge related to the creation of images, which is what I think you feel Like something you lack
I think it's quite common for people to enter modeling without a traditional drawing background, often forgetting that a modeling program is more than anything else a drawing program.
And it seems common sense that one uses a drawing program if one knows how to draw, just as one uses a musical instrument if one knows music.
In summary, I think that if you increase your skills with traditional drawing, your renders and models will improve a lot, you have good qualities

Well, if you already have a basics in traditional drawing, that explains your inclination towards modeling, I guess you'll agree that it's a form of drawing.
And I guess you'll also agree that the more knowledge you have in that field, the more tools you have to create both models and renders.
What I want to emphasize is that you can rely on your knowledge of traditional drawing, and that will give you the security that you feel you lack.

At the end of the day, there are your images what will sell your models

Most of your models look great but I'd work on your rendering. I advise you 2 use some HDRIs and various lights to catch the edges and hi-lights of your models to make-em-pop! Plenty of free tuts around on the net to help ya with that!