I'm getting crazy. I get some decentish stuff and seconds later some horrible monsters.

What can I do? I'm using fun with pencil from Loomis, not sure I like it but keeping at it

I was suggested to study having fun with a pencil, from Loomis. I'm not sure I'm improving much, but for sure I'm totally not coherent, with some stuff looking decent other horrible all drawing one after another.

I feel so dumb. Any help?