England's Danielle Wyatt also achieved career-best position in the T20I Player rankings after the visitors defeated India 3-0.
Raman reckons that there is scope for improvement as far as skillsets of the team is concerned.
In the 1st and 2nd T20I, whether chasing or batting first, India managed less than 120 runs, which is below-par against a top team like England.
Ecclestone was named the ICC's Emerging Player of the Year for a stellar 2018.
Mandhana reckons playing fearless cricket in the domestic circuit will take time because batters have the fear of getting out.
Chasing 112, England Women won by five wickets in the final over in Guwahati.
Brunt claimed 3/17 and Linsey Smith 2/11 to keep a check on India in Guwahati.
Mandhana also said she doesn't regret electing to bowl first in the first match, despite the bowlers giving away too many runs.
India handed Harleen Deol her T20 International debut in the first match against England, which the hosts lost by 41 runs.
The three-match India versus England T20I series kicks off in Guwahati on Monday.