Well there wasn't really much going on in there so thats why I didn't give a full explaination on what to improve on.
But ill try to give some tips if they would help lol
- Try using Bubbles C4D and put it on Linear Dodge or anything that suits you and erase what you don't like
- A trick I use that not a lot of people know is make a new layer, apply image (Image-Apply Image) and go to Filter-Other-High Pass and send it to about .5 than put it on Overlay which is like a Eazy Soft Sharpen.
- Try different gradient maps and play with the settings like put it on Hue or Soft Light etc.
- Use Stocks like Forest, Space, Battlefield, Building, etc.
Hope I helped you somewhat lol
if you don't know gradient maps I can tell you some pretty good ones.