This is one I have attempted to view through the telescope but which is fairly difficult to view. Through the telescope and in any image taken in the visual spectrum the Horsehead nebula is a dark patch of dust and gas against the glowing background nebula. This painting is based on an image taken by Hubble in the infrared, a wavelength in which the gas of the nebula can be observed. It's just a very tiny part of the much larger Orion Molecular Cloud Complex.
As all of my iPad paintings have been, this was done with Procreate using an iPad Air 2 with a generic stylus.