Finished bit of concept art for an upcoming project. The project features Angels & Demons in grand abundance, and I've been working on my own concept of heaven, angels, and what lies above. This is an example of a Sentinel. They have wings (not all angels too, only the higher ranking ones) and most sentinels have their halo around their eyes as seen above. Halos are a measure of status, rank and power in the Kingdom (my version of Heaven). The diamond-like shapes adorning this halo also indicate a kind of rank.
Its obviously still very rough, but its just meant to get some ideas established. How the halo looks, the fact that most Angels are porcelain skinned, etc. More will be coming, and further details of this project should arrive soon.