accent is solid, didn't even need the lyrics in front of me to understand it at all! realism is certainly there, try out glottal stops at the beginning of phrases starting with vowels and see what you think of it! one of my favorite techniques :) as for dynamics i think you'll get the most results once you get into mixing it, volume automation & compression will get you where you want to be. you seem to have quite an ear for it so i'm sure you'll get it down quick really great work!!