Personally I think that Alien is great film, because of it's uniqueness of the alien beast and the strong and realistic human characters. It's an interesting portrayal of human nature and survival, and also focuses on the psychological fears that the audience has and puts it into one beast. This is a triumph as a unique science fiction film and it terrifies me so much that I am unable to watch this film again.
Figure 1- http://www.therobotspajamas.com/wp-content/uploads/2014/10/alien-poster.jpg
Figure 2- http://en.wikipedia.org/wiki/Alien_%28film%29#mediaviewer/File:Alien_%281979%29_-_The_Alien.jpg
Figure 3- https://www.google.co.uk/search?q=close+encounters+of+the+third+kind&biw=1138&bih=488&source=lnms&tbm=isch&sa=X&ei=ObZoVJy7F4nmavmbgrgL&sqi=2&ved=0CAcQ_AUoAg#tbm=isch&q=close+encounters+of+the+third+kind+alien&facrc=_&imgdii=_&imgrc=fYdhCcWLuUJhRM%253A%3BnnJmtTjESC2JLM%3Bhttp%253A%252F%252Fwww.theyoungfolks.com%252Fwp-content%252Fuploads%252F2012%252F05%252Fclose-encounters.jpg%3Bhttp%253A%252F%252Fwww.theyoungfolks.com%252Ffilm%252Fpreparing-for-prometheus-top-10-alien-movies%252F6753%3B728%3B409
Figure 4- http://s3-ec.buzzfed.com/static/2014-05/enhanced/webdr07/19/5/grid-cell-14142-1400493075-2.jpg
Figure 5- http://s3-ec.buzzfed.com/static/2014-05/enhanced/webdr06/16/7/enhanced-buzz-wide-21488-1400241471-9.jpg
Figure 6- http://s3-ec.buzzfed.com/static/2014-05/enhanced/webdr06/16/7/enhanced-buzz-wide-21530-1400241488-18.jpg
Figure 7- http://www.vagallery.com/uploads/2/5/9/7/2597378/548974759.jpg