I've been playing bass since 1980 and I think your technique is quite good - no doubt at all that you're heading the right direction! But you asked for commentary, so in the interest of constructive commentary, I'd offer this:
- From the video, I can't tell whether your right forearm is resting on the bass body above the bridge/saddle area. Try to avoid that by getting your right elbow a bit further "up and away" from the bass body. This will serve several purposes long-term: a) it will get you a bit more "on top of the instrument" which allows you to be a bit more forceful on the "1"; 2) it will reduce the possibility of carpal tunnel syndrome in your right wrist by giving you a more neutral wrist position; and 3) it will reduce possible pain in the forearm and/or cutting off blood flow to your right hand.
- Regarding your left hand position, I see that you use your third finger fairly often, but you are good in that you bend at the knuckle closest to your fingertip so you come straight down on the string from directly above it rather than reaching for the note with a more flat or angled third finger. Take it from me, the third finger is the place most likely to result in injury from long-term playing. I blew out the ulnar nerve in my fingering hand when playing many gigs and one night, I lazily reached for a note on my double bass on the low E string and I didn't get on top of the fingering. Zap! I felt a twinge and tingling; played the gig, went home, and when I woke up the following morning, I couldn't move my left hand. Six months of physical therapy later, I relearned fingerings. Just a word to the wise. Unlike for the right hand, keeping your left elbow even more close to your body will help you stay on top of the fingerings.
- You're hitting the notes (very well, I would add), but your line could use a bit more fluidity. This comes with time and familiarity with your instrument, a better understanding of your body as it is constructed, and the pieces of music you play. They say it takes 10,000 hours to become an expert on your instrument, so keep that in mind and just keep playing. One way to develop fluidity is to take a bassline that you've learned, such as the one you posted, and sort of make it your own. As the video stands, you are fairly faithfully reproducing the line, and there's plenty of reason to be able to do that. But there's also plenty of reason to play the line as you might have played it. I don't mean changing the line entirely, but one way to add texture is to take a bassline that's basically all articulated notes (meaning all notes are plucked or picked individually) and add in slides, hammer-ons, pull offs along with the directly articulated notes. Some lines are more suited for this than others, so keep that in mind.
Lastly, please don't think that I wrote all this because I think you need a great deal of improvement (although all of us should always strive to get better if we can). No; I took the time to write all of this because I think your playing is good enough to benefit from some constructive input to get you to recognize your own singular voice on bass and to take things to the next level. You are making great strides, just keep at it.
