Hey man. You are showing your pictures on the internet. People will look at them with monitors that don't go much more than 1000 pixels vertically in terms of resolution. Posting a piece that's over 2,5 times that size will cause some major scrolling and that's no way to show your picture. I could download the picture or open it in a new window to solve that problem, but the point is - when you show something to others, make it easy for them to see.
You need to work on your composition, story telling, perspective, colors and lightning. Where's the focal points in these?
There's some good stuff going on in the 1st picture. Don't relay on digital effect - I see smudge, sharpen filter and strange texture everywhere.
That was some free of charge, honest criticism. Have fun painting!
I can tell from these samples that you have talent. The main thing I see here is that all of the pictures look like they come straight from your imagianation. I would suggest some studies from references to augment your free drawing. It's very hard to paint anything convincingly from your head without studying the subject thourghly first. The next step is to force yourself to spend the time it takes to really do the subject justice.