These door frames are just a small sample and may be a kit or bespoke to your exact sizes, it just depends on what you choose and what your door frame requirements are.
See some DIY tips for Renewing a door frame
Note.... All frames must be viewed from outside for external situations and from the hallway or main room if leading from a lounge to a kitchen / dining room, you must therefore choose the correct "handing", eg; make sure you choose the glass (if required for eg; a side frame) on the correct side (left or right) of the frame and always viewed as set out above.
The chosen image/frame type will overide any subsequent notes that you add to your order as far as the "handing" is concerned.
Any doubts, ask for advice.