Better means 'besser' and best means 'am besten'.
better = besser
verbessern ich will mein Deutsch verbessern = I want to improve my German
best means am besten.
Doll face in German is dasPuppengesicht. This might not be as flattering in German as in English! Hübsch, German for cutewould be better.
Perhaps the best is yet to be in
größer ist besser
"Mein Deutsch wird besser", you might say "Mein Deutsch wird schon langsam besser" (my German is getting better slowly), as well.
Viel Glück!
I say yes
We say in Germen : der beste Freund
You say "Ich bin dein bester Freund."
The best one = der/die/das Beste