Riyahd Cassiem is a digital artist, art director and illustrator from the great town of Johannesburg, South Africa. His talent is absolutely phenomenal as you can see from the below given artworks. If you wish to see more of his work, I would definitely suggest checking out:

Blind Elder
Disintegrate
Drones
Droniod
Moon Flower
Necron
Precursor Concept
Raid
Replicator v1
Replicator v2
Siral
Tech Head