Right hand (plectrum) looks ok. Perhaps a bit off with pick angle. You may want to have the pick more perpendicular (at a straight right angle) to the string. It appears that you are slightly pointing up a bit with the pick and thus your up strokes hook the string a bit stronger than your down strokes.
Also the (slight) scratchy sound can be eliminated by keeping the pick more flat against string (not catching the edge of pick).
Your left hand has more issues.
Pointing up the neck reduces your position reach and renders your 4th finger useless.
In your case your 4th finger not only is not being used but you are adding to hand stress by clutching and pulling it back away from and underneath the finger board.
Check out my site for more details and technique basics.
(see links below,) good luck.
Rudi
Bass Logic
click on "technique" from center menue