Hi mate! Congrats on your first REC take!
There basically two main things to have in mind during the next days of practice. The first one is timing. You are not going tight along with the backing. There are timing issues in many parts of the lesson. I could say that the whole lesson has timing issues, since the riffs are not being played precise, and the problem becomes even more important around 00:48, 00:50.
I think that the best way to work and improve this is to practice at a slower tempo, and trying to follow the beat with your foot (tapping with your foot) and if possible also with your head. This will help you to assimilate and feel the groove.
Another thing that I note here is that you should work on articulation of the riff's notes. The notes sound like with staccato while the original lesson's riffs sound smoother. This can be related to the fact that you quit your left hand fingers too early, or maybe you are muting the notes too much with the palm of your right hand. Please check it.
These are the first 2 steps to start polishing this one. Please work on it, and then we will focus on other things like dynamics and vibrato.
Cheers!
PS: We are starting a mentoring thread with Alex5
HERE, and this is the first assignment.