@juliavido5 ....I had ask the same question in another post about the "shaky" issue. I too struggle with it. I am a little over 3 months into copperplate and I have taken the advice of ....practice practice practice. But something else I noticed about myself and this is comming from a beginner so I am in no way an expert but...when I am just practicing or playing around I do better. When I write something that is going to be seen by someone else (online or in person), I'm worse. I think it's because I am so worried that it won't look good it makes me nervous and it shows with the shaky lines.
Another thing I have noticed is ...I watch Instgram videos and look at work from The experts and masters and I think to myself "I just want to be that good at it". These are masters that have been doing this for years and it looks really beautiful and smooth in pictures and videos, but if you will zoom in really close SOMETIMES you will see shaky lines in their work too. They will even say "this took 3 trys to get it right". So even the masters and experts are real people too...lol.
So I guess what I'm trying to say is don't be too hard on yourself, there is a lot of things to have to remember to do all at the same time (hand grip, posture, slant, etc) and for me it shows up in my work. I know it's frustrating but, Please don't give up, I won't if you won't
Now, I just have to remember to take my own advice :/
Btw...I think your work is REALLY smooth!!!