There are no shortcuts if you want to become truly proficient at something. Learn from the ground up and master the basic foundation of visual art. Unless you do that, there will always be glaring problems in your work, and you’ll always feel crippled by the holes in your knowledge/insight.
The red rim lighting on the figures don’t work in all areas, since you’ve got some areas that the red lights wouldn’t really reach, or even if it does reach, would not look the way you’ve depicted the lighting.
There’s a lot of inconsistencies in how you portray form and lighting, and this is due to a lack of proper training in observation and analyzation of forms and shapes and the behavior of light and shadows. You’ll have to go back to the basics and do some homework if you want to progress beyond your current level as an artist.
The anatomy/figure is also awkward/stiff/unnatural. You need to use proper reference (shoot them yourself if you have to–use family, friends, yourself). A mirror, a tripod, and a camera with household lights can do a lot–in fact many professional illustrators rely on that type of cheap DIY reference shooting for the illustrations they do for sci-fi/fantasy novel covers.
You also need to study composition and perspective. You can’t have a solid foundation for a scene of any kind without having credible looking perspective and artistically sound composition. The are the essential basics of all visual art.
I highly recommend you read the sticky threads at the Art Techniques & Theories forum (linked below in my signature). They contain tons of very helpful information that will aid you in your artistic growth.
