I like the simple and colorful design of the pet! Although, I think maybe some icon/additional decoration for the face of the pet would make it better. For instance, you could add a pair of eyes or a mouth to give it the feel.
Colors are mismatched, should add more pics. Personally I think you should try to add to it rather than just copy it (I know you’re doing a tutorial and youre probably new to blender) but it would serve you more to experiment and be different from the rest. Good work