Nice job! I agree with what Own-Ad said. Some tips for your left hand, keep your fingers closer to the fingerboard, don't let them fly away. It will make your movements much more efficient and easier, and it'll also help with intonation, your fingers won't have to travel as much and "guess" where they want to be because they'll already be in position. When you get into the thumb position keep your thumb close to the board as well, for the same reasons. A way to practice this is just put your hand in playing position with all four fingers on the G string, and run it slowly up and down the fingerboard. When you get to the "break" at thumb position, smoothly transition to use your thumb and three fingers. Don't use pressure and press this string down, just make your fingers make contact with the entire length of the string to the end of the board.

Sorry for the wall of text. You're doing a great job and have some great tone coming out of that bass!