I agree with gbpens assessment on proportions above. I like rounded, angles and squares, but in the right proportions. I have made pens with angles and 1° angle difference between one pen and the other sometimes makes all the difference in the world. As to round, I like rounds well but the proportions seem off a tad.
I am not an artist but happened upon the right proportions on a few pens, but not on many more. My son in law is an artist (and a teacher) and he has an eye for the right proportions. Most artists do. I wish I had it, but I just have to hit or miss.
And thanks for asking. You will succeed!