I started to sketch some pictures. Is it worth it?

Hi.
I am new in drawing, but I like to draw with pencils. It give me a peace in my soul and life. I want to show you some pictures I draw. I know, that some are not so good, but it was my first attempt to draw something. Good criticism is better than bad compliment

This is my first sketch. It take me some hours to complete, but it was fun:

It is from one very popular computer game. Do you now which one is it?

After that picture a bought my first pencils.

Which pencils do you use?

With my new pencils I tried to draw something harder and because I like horses, I download some pictures from internet and this was my first horse.

My another hobby is scifi movies. What is better the Avengers .

My another "head"

Thank you for your opinions.