Umesh, good work. I have to agree with Gorkhali4982 here. Technicals are all good
but unless you are in right place at right time your skills are useless. I dont know who was that but some famous photographer said "F/8 and be there". Anybody can gain
skills by some practice but being there will differentiate your from rest of the crowd.
 I dont know much about portraits but in my limited experience lighting is everything for
portraits. And by auto if you mean auto mode then no point in using dslr. To get correct
skin tones you need to shoot raw under neutral settings and adjust colour in PP. No
camera in this world can give you perfect colour but your creativity can get you close.
 Sorry to be lecturing but just had to say. :).
BTW my photo album is flickr.com/divdude007
cheers.