Update the Kids t-shirt mockup
You only have the one mockup for the girl and she's pinching her neckline with one hand and pulling her shirt down with the other. Super unnatural! The boy isn't doing this. Why would the girl be doing this and there are no other options for the girl's shirt? Very expensive pack to have the girl's mockup option rendered useless.
Benjamin Monson commented
Never mind. I now see that all these pics are available on Shutterstock :)