Yes, Comio C2 does have the beautfy mode.
Yes, you can use the 4G Jio sim card in Comio C2.
Yes, Comio C2 does have the front camera flash.
No. Comio C2 does not have the fast charging support but you can use Sony CP-AD2 USB Charger to charge it faster. By using Sony CP-AD2 you can reduce the charging time by almost 35%.