Newer to the Game, Need Help With Reviewing

I started playing League about 7-8ish months ago, and have really taken a liking to the jungle role. About 2 months ago (now that i can control my camera without killing myself for the most part lol) I started playing ranked, and have been having some success on Talon jungle.

I am quite low elo atm, but I am interested in seriously climbing. However for jungle I'm a bit confused as to what I should be reviewing in my games. As an example, I was matched against Mundo jg, and after we full cleared i saw him across the map and accordingly invaded his topside. I denied him farm twice in this way, however he then just kind of kept walking in a straight line into our botlane and taking up space allowing their ADC to get monstrously fed, ultimately costing us that game.

As a Jungler, how should I be pressing my advantage when I set my opponent far behind like this? I find I can fairly consistent get a decent to sizeable lead as Talon, which usually translates to us securing grubs and maybe one or two drakes, however once midgame comes there's a lot of downtime between objectives. Since it's low elo we usually just take kind of 50/50 teamfights and whoever wins those gets the next objective, but I want to know how I as Talon can specifically press my advantages, because I'm not learning anything in trying to force clown fiesta tramfights.

Sorry if this is an unclear question, I appreciate any and all answers =)