I couldn't find any pictures of juvenile Black-winged, but I did find a decent pictures of juvenile/immature Black-headed.
http://orientalbirdimages.org/search.php?Bird_ID=2301&Bird_Image_ID=159073
http://orientalbirdimages.org/search.php?Bird_ID=2301&Bird_Image_ID=152612
http://orientalbirdimages.org/search.php?Bird_ID=2301&Bird_Image_ID=130040
These look similar to the bird in the post, but I'm not sure how similar Black-winged are...
The Birds of South Asia the Ripley Guide by Rasmussen and Anderton says about Black-headed juvenile:
"like female but more barred above, with more irregular and buffier edgings to browner wing feathers (pale edgings have blackish inner border, darker than feather centers); below tinged fulvous and less distinctly barred."
and Black-winged juvenile:
"blackish-brown above and brownish-grey below, heavily scaled whitish overall; wing edgings buffy."