What Bacterius said. Plus, I have a few other comments.
First, you would benefit from building yourself a large reference library of images of the real world to study. An excellent place to start (and to just sort of waste time in general; beware) is Reddit's
EarthPorn sub-Reddit. There are some fantastic, high-resolution reference images to be found there. Pay particular attention to the growth patterns of various vegetation. As an example, in your first image you have a very steap, needle-like peak covered in trees. It has been my experience that slopes that steep can not support such thick vegetation. What vegetation would exist would cling precariously to scraps of soil held in place by rock, rather than thick blankets of trees.
Pay attention also to texture of surfaces. The ground texture in your first shot just looks weird and shiny, and not at all like real dirt.
I'm guessing you are using the free version of Unity3D? If you upgrade to the Pro version you can have real-time shadows. As Bacterius has said, you really, really,
really need shadows if you want your scene to look like something newer than the hideous malformed creations of the late 1990s and early 2000s. Shadow is the major visual cue for perceiving the shape and form of a scene, and getting it right (as right as possible, within the bounds of your available tech) is
crucial. Pro is expensive, though, so you might not want to go that route. But really, man, you just can not underestimate the power of shadows. If you do want to make show-pieces with Unity free, maybe consider baking some lightmaps off-line or something. Faked shadows are better than no shadows at all.
Edit: Just noticed that there is some shadowing going on in #2 on your rock, so maybe you do have Unity3D Pro. In which case... add some more shadows, bro.
What the heck is going on with your reflection in image #3? That is some pixelly pixellated pixels there. Yikes.
Your ground cover vegetation looks like an explosion in a flourescent paint factory. High saturation + lack of self-shadowing in the plant batches means that it is going to be somewhat hard on the eyes. You can fake self-shadowing with ground cover by blending the textures with a gradient that darkens them toward the bottom. Gives the impression, at least, that there are shadowed depths inside the vegetation clump, and breaks up the monotony. Also, your grass strands look a bit stiff and wiry. Perhaps introduce a bit of curvature to mitigate the spiky appearance.
Overall, though, it looks like a nice start.
I'm with Bacterius about the water in your final shot, too. That doesn't look like water. That looks like slime.
Edited by FLeBlanc, 05 October 2012 - 08:29 AM.
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