Zakharov, your image looks fine to me. I think a key point to consider is the difference between "detail" and "resolution".
Detail is a potentially subjective term, but it generally refers to the ability to distinguish finer characteristics, small elements of the scene. Whereas resolution, as in 1024x768, is an absolute term which refers to the dimensions of an image in pixels. So you can have a *detailed* image that is not very high resolution, perhaps only 800x600 for example. Thus the resolution limit of 1024x768 is not necessarily the problem for you.
However, I suspect one of the other limitations of the free version of Terragen 0.9 may be responsible. In the registered version you have access to higher levels of antialiasing, which increases apparent detail in various ways. The Extra Blended Detail option of the registered version in particular can give you a sense of higher detail. It is roughly equivalent to a process that others use to increase detail, which is to render at a larger size than the final size of the image (for example render at 1600x1200) and then downsample to the target size (for example 800x600). This process forces Terragen to render more detail for the larger image, which is then more efficiently "packed" into the smaller space (that's a simplified explanation, but I think it makes it clearer).
In any case if you feel detail is lacking in your images, it may be necessary to upgrade to the registered version. But it is certainly possible to create very nice images with the free version as well. In the case of this particular image you might try reducing haze for example as it can make your scene appear softer than you would like.
- Oshyan
