This was for a creature of the week entry on conceptart.org - the title was "Guardian of the Portal Gate". Here was my concept:
Legends tell of a portal to paradise somewhere in the depths of the desert. This portal is not a stone gateway or a door, but a pair of dead trees perched on the edge of a cliff face – it is said that those with faith and courage can step through this natural gateway to paradise, but those who fear and doubt will plummet into the rocky sea below. Seekers of the portal speak of its guardian, a strange creature of unworldly and terrifying beauty that fixes you in its gaze and fills you with an overwhelming fear that sends you running and crawling away back into the sweltering desert.