I've recently gotten PS again and I feel like my images are lacking something...I just don't know what to do to spice them up?

Is there anything I can work on/change/alter/etc to make them better? Examples here: http://halodesigns.deviantart.com/gallery/

It's the newest three that I've made with Photoshop! Please don't feel afraid to be critical, I want to improve!

I really like the second one in your newest three! I think you should work on lighting and on hair. Youve done really well with cutting the image out and getting the general atmosphere to match. 

I favorite a lot of tutorials that I have used to help me with these concepts, as I struggle with them too. Here is my tutorial list, feel free to browse at your own pleasure:

http://xatramentum.deviantart.com/favourites/38741971/Tuts

The only thing I can see is really just. Finishing touches. Things that you pick up a "feel" for more than any technique or instruction.

For example on Purple Desert, just giving the tail "more flow" (helpful, I know). Like more tendrils of hair, flowing out a bit further. Something like that. Adding a bit more depth to the dust cloud by sprinkling in some highlights. Your mane is great, the color and composition is all good, etc.

On waterfalls, the ONLY suggestion I have is adding some kind of reflection or shadow in the water. I actually almost bought that one even though nothing I breed matches Mr. Nate the AQH there. I loved it that much!

Link Tree