This is an original painting in oil on canvas. Painted partly on location on one of my local walks - through the Stour Valley on the Essex/Suffolk border (UK).
It was painted just before rain which made the colours of the trees stand out against the grey sky
 
Painting details:
Surface - fine Italian cotton stretched canvas
Medium - professional quality W&N oil paint
Unframed
Size - unframed canvas measures 30 x 40cm
A certificate of authenticity is attached to the back