Hello Tristen! While a bit late from my side, welcome to ArtSchool!
Your exercises look good, well done ! In case you repeat them in the future for practicing purposes, I'd like to point out some things I spotted which might help ( I hope you do not mind my feedback ).
Try to do the lines with the same confidence as you did the circles. Your flow is good, use your shoulder more, do quicker motions, try and "ghost" the lines over and over before executing the line.
In image adjustments, you need to focus on these: Some colors in the first exercise, being red and cyan, are darker, while other colors, like neon green, turquoise and orange, they are a bit desaturated / lighter. I'd go with color picker and see the difference in the box to see where my difference is in your case, it will definitely help you. Second greyscale and third with the fruits are looking good. Second scifi scenery and last look a bit muddy and there are noticeable differences on the colors in the last one, with highlights being a bit purple. I'd recommend you take your time and play with Curves and even the RGB curve, as well as CTRL U to set the correct hue before doing anything. It's a bit trial and error in this exercise, it also took me a bit to finish.
Still, congrats on finishing the exercises. Baby steps, keep it up and keep practicing daily! We're all together in this journey. Wishing to see more of your progress soon! ^_^
