This is a fantastic piece of art. The positives I can give are plenty. One thing I love in a piece is the three dimensional feel. This piece excels at that. The shadows getting darker towards the back until the light at the end of the tunnel and it's amazing. The picture has a very unique way of space as well. Most pictures that have something going into the distance for instance, train tracks. They typically go in the distance in the middle. But this has a really great way of having the side where the tunnel bend and the tunnel disappears. I really love this. The futuristic yet gritty feel makes me feel a sense of loneliness but a lost memory of a civilization that was extremely intelligent. I don't have any real complaints and I highly recommend it. Thank you for giving me a chance to review your art work and please comment if you have any suggestions for future reviews.