Hand drawn objects

Hello!

I have a question about some illustration used in vintage logos. I saw that some people have awesome hand drawn illustrations. They are using a graphic tablet or just some effects in illustrator?

Eg: IMAGE 1
IMAGE 2
IMAGE 3

Ok so that barrel and those 2 bears trying to … a tree seems to be easy to be created in PS or AI, path by path, coffee by coffee… But how about that seed?? Those shadow lines kill me sometimes even when I draw on a sheet of paper :unamused:… Maybe the author used a graphic tablet then converted it to vector in AI or sth?

Thanks a lot!