Why do these look like plastic?

[L B]

Can't get the look I want. Any advice? They look... out of place. Maybe it's just the lack of AA, but I can't figure.

 

[Josh]

The trees appear to have no specular reflection. Your ambient light level is very bright and isn't tinted blue. I'd also enable edge antialiasing.

[omid3098]

and dark your fog color just a bit

[Masterxilo]

And maybe all the palm types should have the same trunk/bark color.

[Richard Simpson]

And maybe all the palm types should have the same trunk/bark color.

 

Yeah, I agree. The first one is correct. But the one behind it should belong on that "finger" palm tree.

 

The finger looking palm.