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Looks like you're getting your flash position and exposure in place. Were these shot in TTL or manual mode? If manual, good job. If TTL, well, the equipment did the work for you. (Hope it's manual. )
Compositionally, the first four are too tight in my opinion. Numbers 1 and 4 are okay, because her head is resting on her hands behind her head, which makes her looked more relaxed and comfortable. Numbers 2 and 3, where her hands are in front of her, on her scarf, make her body position appear to be trying to lean away from you.