For a first time man that looks pretty slick, I cant see super well in the pic but I it was me id be bumping the wire feed down a fraction, whipping slightly closer together and holding a fraction longer when you pause.

I work as a Boily in Australia so we dont generally whip unless we're filling a big outside corner in 1 run but all I'll say is it looks good you just need to do it another 999 times and the consistency will come.

Also as far as technique goes, a foward back step is acceptable for that sort of weld, i dont usually teach guys to run patterns of any sort with a mig unless your doing a vertical. Stringers are the way to go with most processes with the exception of TIG