Hey Eevee,

I am a beginner so my feedback is limited - a few comments nonetheless:

Lines

It seems you are making confident marks, don't be too critical about that. I don't see many wobbly lines in your work and you are right to focus more on accuracy going forward. Try to lift your pen when you want to stop the line to reduce overshooting.

Ellipses

These look great, I think if you keep drawing them every now and then as a warmup you will get tighter lines.

Perspective

I feel you understood the exercises and did them to the best of your current ability, doing the 250 box challenge will help you improve your grasp of perspective.

Overall I think you can be proud of your work, keep on keepin' on.