This is an immature lacking obvious yellow on the head. Three subspecies winter in this area but are not reliably distinguishable in non-breeding plumage. Canon PowerShot SX50 HS.
References:
Ali, S & SD Ripley (1987). Compact Handbook of the Birds of India and Pakistan. Edition 2. Oxford University Press.
Alstrom, P., K. Mild & B. Zetterstrom, (2003). Pipits and wagtails of Europe, Asia and North America. Identification and systematics. 1-496. Christopher Helm, London.
Rasmussen, P.C. & Anderton, J.C. (2005) Birds of South Asia. The Ripley Guide. Vols. 1 and 2. Smithsonian Institution & Lynx Edicions, Washington, D.C. & Barcelona.
Tyler, S. & Kirwan, G.M. (2016). Citrine Wagtail (Motacilla citreola). In: del Hoyo, J., Elliott, A., Sargatal, J., Christie, D.A. & de Juana, E. (eds.). Handbook of the Birds of the World Alive. Lynx Edicions, Barcelona. (retrieved from http://www.hbw.com/node/57827 on 28 June 2016).