Implied odds is alot about reads rather than not having reads, so here are some general thoughts...
You've seen Villain call all in w an overpair/TPTK in some prior hand. Best possible indication that you have good implied odds. When you see someone do this, you should take a note that he does this - but make sure you also note who he's doing it against and what the circumstances are.
Villain's opening range is very narrow. If Villain only opens 7% of his hands utg (I'm taking it to an extreme), his range is 88+, ATs+, KTs+, AQo+. A significant portion of his range is so strong preflop that he may not be willing to let it go postflop if he flops well. Contrast that w someone who's opening 20% of his range in MP - that range is much broader, the chance for Villain to "fall in love w his hand" is much worse, your implied odds drop cuz there's a greater chance he'll fold.
What have your actions been in the hand so far? Is it obvious you were drawing (i.e., you were playing passively) and that the turn or river card complted your draw? Or were you the aggressor, so you could've been betting top pair or an overpair rather than a draw?
How obvious will it be that you hit whatever you needed to hit? If you're drawing to a flush and the flush hits, it generally doesn't pay off all that well, you don't have to be a genius to figure out that you hit a flush if you weren't aggressive and suddenly become aggressive after the flush completes. Hidden straight draws are awesome for implied odds, cuz they're much less obvious than flushes.
Does Villain think it likely that you're bluffing
? Or does he think that any time you bet you've got the nuts? If the latter, your implied odds are roughly zero.