The first thing I thought was an over-reliance on digital tools like filters. Step back from Photoshop and try more traditional techniques to gain a better understanding of the foundations before you force yourself into a corner. You need to know where the long road goes afore ye take a short cut. Next learn to use references - metallic surfaces, boars and light look much improved once you understand how they function and appear. Even if stylised, a good understanding of real forms is required. Finally try studying some human anatomy - an excellent site for references is fineart.sk
nice work so far, these are some impressive pieces. A few suggestions - on the first piece, the colors look too saturated and maybe a little too monochomatic as far as I think the demon could use some cooler colors in the shadows instead of just dark red. You did a nice job on the mechanics of the perspective, but I think it's just the wrong choice of perspective; the view is too far removed from the action. The second one does a good job of this, though. The fifth image also looks like it's gone through too many filters and feels a little too grainy. Are the red spots intentional like sparks or flames? Right now they feel a little accidental. Other than that, keep up the good work and keep posting!