Adrosu should have non-mute lines for journal stages 60 and 65 OR he should have a Goodbye greeting
Journal should indicate that you'll need a piece of paper, a quill and an inkwell. Might not be obvious.
topic 'geewp eee': Should have a line for Adrosu for journal stages >=30
topic 'geewp eee': "What? Oh, you've been speaking to that man down the road. [...]" should have journal > 0
topic 'regrowth potion': "You have no idea how good it feels [...]" one of the entries doesn't remove the potion
topic 'regrowth potion': "What? You want a regrowth potion?  [...]" should have journal > 0
topic 'regrowth potion': There's no entry if you don't have the 500 gold but agree to pay.
topic 'Greeting 1': entries should have addtopic "geewp eee"
script 'TR_m2_q_AB_end': needs stopscript after setting doonce
script 'TR_m2_q_AB_report': needs stopscript after setting doonce
It might be better to have a script on the thief instead that does the same things as the two above.

script TR_m2_q_AB_Adrosu
- I think in this case GetHealth == 0 should always work but it's good practice to learn to use if ( OnDeath ) instead in general
- may need checking that the quest has started "TR_m2_wil_Tongue" > 0 before giving a journal message on his death

there are voice entries for Voice:attack etc, which is a good touch, but since that NPC has his own script it's better to just put
short noattack
short nohello
etc in his script, these are local variables that already have generic empty voice entries ("nohit" doesn't in vanilla but will in TR soon)

script TR_m2_q_AB_end: if this NPC is in the exterior I'd just put

if ( CellChanged == 0 )
    return
endif

at the beginning of the script so the script stops faster if it has nothing to do

the Temple NPC that claim has you report to happens to be the temple questgiver Ratagos
I don't remember his character but it might or not agree with killing the poor bastard
if it's Ratagos you'd want to give him dialogue variants if player is from the Temple tho instead of just calling them outlander, especially if they've done his quests