without cnc it cannot get better, just don't be a penis head 
the text could use alittle work, needs to be blended in even if all you do is lower the opacity.
the contrast is to high, although that looks good sometimes the majority of the time it just takes away from the piece and all your works seem to have high-very high contrast. is your monitor color/brightness/contrast settings off, or do personally like the high contrast? try lowering the contrast, and using other styles in your work. that seems to be a pretty big problem with artists on here they have a habit of doing the same style in all their work. could be that they just really like a certain style, or they just don't like trying new things for fear of failing... not sure why.
like your GGT entry, it would look so much better if the contrast was not set so high or if you had a layer on top that was either the high contrast version or the lower contrast version and you erased/blended parts. it would add more depth.