"Showing basic touches can make a BIG difference."
You're not showing much, and certainly no basic touches...
I would start with the landscape. Random patch of flat rocky soil looks weird. The trees do not help creating a credible environment either. There is not a single bush in this screen. Add underbrush and a few more different trees that look good together.
ehhhh... could you maybe zoom out a bit, the coaster is kinda hard to make out
Needs work (I mean a lot.) but like Sens said, a more zoomed out picture would help us.
You're not showing much, and certainly no basic touches...
I would start with the landscape. Random patch of flat rocky soil looks weird. The trees do not help creating a credible environment either. There is not a single bush in this screen. Add underbrush and a few more different trees that look good together.
There's also a lot of tree clipping, try not to be so spastic with zero clearance.