I don't believe you need to make your scene playable as long as you've made your beauty renders in Unreal 4. Some artists add a cinematic as well, simply a camera moving through the environment to music. These were some of the better submissions for the Ubisoft Nxt showcases here in Toronto.…
Here's one example of a piece for level design. (not exactly environment art, but in the realm) https://www.youtube.com/watch?v=NtuHAh9yciM It was made in far cry's editor for a level design position. I don't think the applicant got the position (not sure of the reason) but its a great example of what you're looking for.…
Here's a good example of a full game project done at a game dev school. https://contragon.itch.io/contra-2028 Not everyone that participated found employment right away and all their portfolios are variable. I think in this case the game certainly helped provided each artist focused on a dedicated role and created a…