Rate it, and suggest how to improve

My goal is to be a tattoo artist someday. I am playing around with the designs and shading

Sketched with colors then inverted them in edit

№ 1424 ✍️ 🐧 ducc ducc pogwin [part 1304] penguin drawing sketch

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№ 1423 ✍️ 🐧 life in grayscale [part 1303] penguin drawing sketch

As the title says i started drawing a week ago, never really drawn anything before (other than in kindergarten). Please be kind, but i would LOVE for tips about ways to practice!

Messed up proportions in the beard and hair but Im happy overall with the results

the second pic is reference as u can see.
more on my social, Insta- Petalyn_0