I Need Some Violinists'/Violists' Advice

Hi! So for those of you who don't know, I am in the 8th grade, and I am going to high school next year. So, since I compose and wanna make a good first impression, I was making a piece to show the high school orchestra director "my skills". And basically this is it, and I made it much harder because, again, high school. But I don't play violin or viola so I need some advice/feedback on the chinstrument parts. Thank you in advance, and please comment your favorite measure(s)!