77 on Q56r

Small pocket pairs I would usually just set mine and play fit or fold OTF. For me it is everything under 88 and the rest I call at least once, but I think calling flop with 77 is decent option too.
OTT I think I like just calling.
OTR your bet size maybe could be adjusted a bit. If depends on what we are targeting. If you want a lot of calls from some pocket pairs or Qx I think you have to bet even lower. If you want to target villains sets and 2 pair hands maybe you could tank a bit and bet huge? That might look like a bluff to villain and you would get more value out of his stronger holdings.

Calling with PP can be tricky (and outright wrong) but on this pecular spot you did it well.
River I would indeed chose between sizing 1/3 to torpedo the bluffcatches or nearly pot to squeeze value out of big hands (or paranoied callers), your choice in between may be the least valuable one.

Ok. Thanks. I have to get used to this really little bet sizes. I thought my river bet was already very small..

I would fold OTF as a standard. But in this spot I think we can call, as we have position and scnd pair. OTT we got some outs, so I´m calling. River for 1/3 sounds very good to me.