Hello! I'll be critiquing your work.

You're right your lines grew more confidence at the 100th box mark. You did a good job utilizing different rates of foreshortening through the challenge. Your line work is looking clean and confident which is great, you show that you're using the ghosting technique and spending time planning out your lines before hand which results in solid looking boxes. Sometimes it looks like you're trying to apply line weight and while it does need some work it's a good start, just remember we want to apply it subtly and to maintain our confidence while drawing the additional line, accuracy will come with mileage. Ditch the horizon line, focus on relative convergence, a variety of orientations and proportions, doing so helps you have a well rounded understanding of how boxes will behave in different situations. Remember, your boxes don't have to be perfect what matters is that you are consistent with your boxes.

Please take note that I am a beginner like you, take this critique with a grain of salt as it is based on my thoughts, this guideline (https://pastebin.com/dbjR9MFj) and official drawabox critiques.