It's also important to mention that if you see scene which you like or something thrills you, don't forget to take screenshot of it ! Our memory very likely to forget things so having a screenshot(s) from scene which you liked and by extremely useful when you decide to start working on something. I don't have copying on my mind, but in this way you can way easier understand how digital environments are designed, how static objects are placed, take a look on shadows and compare their color to sky color or you even can try to beat game scene visuals by recreating it in different way. Newer stop believing in yourself and you will reach something :)
What is more, there are a lot of things around us what can inspire, you just need to have sharp sight.
I gain a lot of inspiration from places were I visit etc so newer forget to travel and expand your outlook.
That's all for this time. I will try to write more helpful tips for 3d environment design.
I also added some my favourite screenshots from various games what I have played in last 3 years. It may inspire someone hehe
By the way, suggestions, notes or random ideas are welcome in comments section :)
(Screenshots were taken from following games: Dead Space 3, Skyrim, Metro 2033, Crysis 3, Thief, Battlefield 4)