They look too artificial.
Are they too dark? My screen is awful. I have brigthness to the max level and I see everything darker than other monitors; so when I see them ok here, they are actually burned by the sun on other monitors.
I think they look good, the only things to me that look out of place, or make it look artificial is the background. You rendered image has good lighting in the shadows of the trees. The background image is very dark, and makes the rendering stand out.
In the second one you dont have that problem and it looks better becuase of it.
Lupaz it sounds like your gamma isnt set correctly on your Monitor, you should set it with Adobe Gamma and save the output as bla_lupaz.icm or bla_lupaz.icc color profile. Then load that into your graphic card color tap. Then in 3dMax set the correct the gamma value in PreferenceSettings, gamma tab. Make sure the monitor is on a while. Once done as you save an image out of 3dmax always use system default…Works for me..