>>19094717description here
Sunny summer day, under the shade of an tree, blanket down on the grass, Fluttershy in the middle of it
Sitting up. on the side of her legs, weight shifted slightly, hand on the blanket keeping her suspended, the other resting on her calves (pic sort of related)
No idea how you draw faces, eyes, hair, so I'll leave that for you to decide
Body portions
Tall, thin, petites, slim legs and and arms and lastly...-Slightly- big boobies
No titan tits, just make her moderatly well endowed like here
>>19093096 C cup should be the most you need
Clothes, Like I said, hotpants, tank top, spaghetti strap bra. Colored yellow, yellow and pink respectively.
Few last things
Have the angle up looking down on her, if you can manage
Give her a very modest smirk
Eyes looking slightly to the side of the viewer's
little bit of visible cleavage is good if you can manage
and above all else I must stress...
Try and have her look both cute and sexy. No anime-esque extreme of either, just a subtle balance of both
Those are my guidelines for you. Bend or break them however you feel is nescessary. It's your art, take pride in it