Unless the dragon has Mythic Wings or the Multi-winged mutation, wings will always attach on the back of the dragon, somewhere between the neck and tail and above the legs.
Wingless
Pretty self-explanatory. They have no wings.
Leather Wings

Wings resembling a bat or pterodactyl. Leather wings do not create webbing between the tail and legs. You may choose to make the entire wings fingered or just add one finger. The ‘arm’ part and top finger are mandatory. The leather must have at least 75% opacity. The leather must attach to the body.
The examples below are not accepted as leather wings without the corresponding traits. The first and second are missing supports, which can only be done with the boneless trait. The third has long extensions rather than a bat-like or pterodactyl-like structure. The last example shows a ‘tail’ of leather not attached to the body. Any leather on the bottom edge must attach to the body.

Feathered Wings

Wings that resemble that of a bird or bird-like theropod. The feathers will usually be long and capable of flight. You may choose to replace the feathers with proto-feathers or shorten them if desired, but this will make the dragon flightless. Feathered wings may either use the normal gradient across the whole wing or use different solid colors for each layer of feathers (black flight feathers, white coverts, etc. within color rules) for up to three different-colored layers. You do not need to draw each individual feather.
Insect Wings

Wings heavily inspired by insects! You may have one or two pairs of wings. The ‘cover’ typical of beetles counts as a set of wings. You may imitate the shape of any living insect wings (such as Luna Moths or beetles). They must have at least 75% opacity, even if their inspiration is transparent. They will not show iridescence without the proper trait.
Artificial Wings

These may resemble any sort of wings, as long as it is clear that they are constructed out of metal, clay, or another artificial material. Materials (including glass and plastic) must have at least 75% opacity. You may choose to draw the dragon without artificial wings. In that situation, the dragon would be either wingless or show some sort of condition that would keep it from flying normally. Design must focus on function rather than aesthetics, which means designs tend to be simple and materials limited to two or three. More info here.
Scythe Wings

Large, curved, movable scales that project from the same area and loosely resemble wings. They are created by a unique magnetic field around the dragon. This same magnetic field will allow some wings to float off of the body. The entire scale may also be spiraled. They are a solid material and are sharp enough to be used as their namesake. Scythe “wings” do not aid in flight, rendering dragons with scythe wings flightless. They will angle towards the shoulders, rather than down the back as spines.