Is going for a calorie deficit the best thing for me?

so i wanna get sexy legs and butt. i mean toned legs and a rounder butt. i am 5'1 and 102-103 lbs so i am at an okay weight. but someone told me to do bodyweight squats and lunges and go for a calorie deficit (i have to eat 1600 to maintain my weight while working out and he said i should eat 1400 and 60 g of proteins). i am not fat but saggy, have cellulite and a bit of muffin top. but i am scared my butt will just get flat if i follow this program. he told me to go down to 98.10 lbs

this is how i'm looking if it helps https://imgur.com/a/ILm8P
Is going for a calorie deficit the best thing for me?
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