-When you produce the sponge ball it's off camera, so I don' know what the production looked like, but she didn't react at all. She cooly just says, "Uh huh." Not sure if this was just an off reaction to what you normally get with the first production, but you may want to reconsider it.
-You refer to the sponge ball as a "little clown nose thing." Do you want to be known as the guy walking around with "close nose things"? Maybe you do, maybe you don't--but it's a question you want to ask yourself as to how it pertains to your character.
-The girl throws at a really funny line: "Is that a growth on me or something?" That was a great hook to connect with her and have some fun and you ignored the line because you were too set on your routine. This is a pretty normal mistake to make when you're first starting out, but it is something you're going to want to get past.
-When you deliver the line: "You look confused so, here, I'll make it easy for you," it comes across a bit demeaning. That's the kind of line that can make someone into a heckler. No one wants to indirectly be told they're stupid.
-When you introduce the Harry/Ron thing it seems to annoy her more than entertain her. When you did the joke about making them switch places then asked her again which one she wanted her tone was that of annoyance when she says, "Ron." At that moment she felt her time was being wasted. She wanted to some action and she wasn't getting it. When she says "Ron" what her tone is really saying is, "Quit f*cking around and get on with it already."
-After you make the two balls appear together in her hand the first time she gives a great reaction. Don't be too quick to rush on. Step back and let that amazement marinate for a moment.
-Slow way down on the Ring Thing. Don't be afraid of letting them clearly see the ring is off your finger before you throw it back on.
Those are just a few things, but overall I'd say very good job at both the magic and on coming across as a confident and friendly guy that people are going to enjoy seeing perform. The people you're performing for seem to genuinely enjoy what you're doing. Keep up the great work, Josh!