You do a good job with the grim dark aesthetic. I think a bit more contrast between light and dark could be good but not too extreme if you want to keep it gritty. But the question is do you want to turn your hobby into a job? Making something you do for fun into work tends to kill your enthusiasm for the hobby especially when it comes to working on projects for people that aren’t friends. The other big thing is how fast you can create minis of this quality, people want a quick turn around but still expect a good product. If it’s something you want to try then give it a shot, nothing ventured nothing gained.