The small boy is using his blue shirt to wipe his face, exposing his belly.
The small boy used his blue shirt to wipe of his face, thus exposing his belly.
Маленький мальчик вытирает лицо своей голубой рубашкой, обнажая живот.
Маленький мальчик вытер лицо своей голубой рубашкой, обнажив таким образом живот.