I hate trying to give advise on calling, but you asked
. My opinion is worth what you paid for it.
It sounds choppy to me. Like a pop pop pop instead of a steady controlled air flow Yeawk Yeawk Yeawk. I'd practice air control, one long steady smooth air intake. Once I had that steady high end draw "yeeeeeee" pretty good I'd practice dropping it off to a "aawk". Once I got comfortable with that I'd start practicing running it together and shortening it from a yeeeeeeee-aaaawk to a ye-awk. Right now I'm hearing more of a yop yop yop.
I know that probably made zero sense, but it is worth the asking price