Canonbury station sits at the junction of the Overground's North London Line and East London Line, but in spite of that its entrance is rather modest. It's accessed from the road bridge which crosses the railway at the station's east. Looking towards the front of the station:

The station entrance:

The rear of the station building leads on to a footbridge which has steps and lifts connecting all platforms to street level. Here's the span of footbridge between platforms 3 and 4:

From the footbridge looking west at the island platforms 2 and 3:

On platforms 2 and 3 looking east toards the bridge:

Platform 1's steps up to the footbridge:

Back at the road bridge, looking east along the line: