Hello Jay! Welcome to Artschool ! We're all together in this trip, so let's all do our best !
You did pretty great on the exercises, especially on color balance in fruits, the scifi one and then the assignment with the castle!
A small advice on lines, since for me as a person its one of the most fundamentals in my routine: When you draw, focus the movement when you do the line on the shoulder, instead of the elbow or wrist. With time, your lines will get even smoother and more confident. I do the first exercise almost daily as a warmup before starting my gestures, i'd definitely recommend you doing the same. Keep up the grind pal!