AWESOME!!! This is an exercise that can get boring real fast so I commend you for sticking it out. Two questions: 1) Are you working with a tablet and a stylus? 2) Do you want to be a primarily digital artist? If you do, and you will keep using this tablet and stylus, I would encourage you to just do a gajillion more with the tools you have. But consider using a pen and paper (specifically a pen, for better confidence). You can also spruce up the practice with doing these! I sourced them from Practice Drawing This, and that website has a ton of other fun exercises. I would also suggest their Textures exercise. The main advice I have is to just keep going. There's no specific timeline on how fast you will improve, but quantity matters in these types of exercises. It will really pay off, I'm speaking from experience. I see a ton of layers in your screenshot so you're already halfway there in terms of persistence ๐ฅ
To answer your first question, yes I did worked with a tablet and stylus, and yes I wanna be a digital artist primarily to be an animator one day :3.But yes I'll absolutely try using a pen next time, since I did that with boxes and i learned alot from them. But texture excerice huh, I never thought if that so I'll definitely be trying that. Thankssss alot I'll try to do a ton of them.
Also I just wanted to say- your lines is so clean ๐๐ it just motivated me more to practice
(โฌโฌ๏นโฌโฌ) (ยดโฝ`สโกฦช)