If you want the appearance to look a little better just go over the weld with the torch (washing out) no filler metal needs to be added. When you are doing just manipulate the torch in circles from the top to the bottom of the toe in the weld.
Looks great though, just keep practicing and you...
All is great advice. As a welder my advice to you is take your time and dont rush it, in between passes take a break and let the keg especially cool down SS retains heat well and that is where you are going to get into trouble with blowing holes in the keg.
Take your time bro and it will come...