Your style look good. I made a wip of what might give you some ideas on how to improve you.
![](https://www.avpgalaxy.net/forum/proxy.php?request=http%3A%2F%2Fimg215.imageshack.us%2Fimg215%2F5529%2Fwipdf0.jpg&hash=b629d2ebff3b7fe15074b5552d82a2e7aebe26aa)
Try variating with the colors et keeping all in the same tone.
Playing around with shadows/highlights can drastically give your image detail.
Mix layer composition while adding brush work.
Hope this helps bro