As simple as it is, I feel like that 3rd panel took me the longest to pencil on this page. It's hard to show someone trying not to laugh in a way that it's obvious what's happening, but without making them look kinda... ugly. In conttrast, the second panel is probably the most obviously complex panel... it's a full body shot with some perspective in it, but that one came out pretty naturally. It just felt natural for Nina in that moment.