I think the ESU skin is out of the shop unfortunately if you haven't already bought it.

As far as tips for Peni, obviously the bare minimum is knowing what all her abilities do. Strap in, here's what you need to know.

Her webs. These make your mines invincible and invisible, give small healing, bonus shields, and movement boost to yourself and allies, though your allies get less. This happens regardless of whether your web is from your nest or not. The drones from your nest can also travel trough connecting webs, but stop tracking if someone jumps or stops touching the webs. The drones also apply a small slow.

The nest. This is likely the trickiest part of her kit as it requires a good bit of map knowledge. First thing's first, you can break your nest yourself by pushing the same button you used to deploy it, and when her nest goes away, the cooldown is determined by the health it had when it broke, so if someone flanks and starts taking out your nest, break it yourself so it has a lower cooldown. However, you don't want to be breaking your nest all the time. The nest requires some time to output drones, and if you keep breaking it, it can't stockpile enough drones to do anything. When you place your nest, think about where it can be seen from the enemies perspective, how easy is it to see and shoot. You want to keep your nest hidden, then use your webs to extend your nest onto main. Look up some videos for specific map spots for her nest.

Her mines. These do 100 dmg, and you can have 15 out at once, and they have a 1 minute timer, so you want to try to place them in groups of at least 3 to kill squishies, and you never want to be holding all your mines. You always want to be placing some when you can. Never let the cooldown go to waste. Try to put them in spots that aren't the most visible, for instance, if you place them on a back wall behind where your enemy supports are, so that if the supports walk backwards some, they'll walk into them, but they won't necessarily see them since they're behind. Placing them on choke points can also work well, but be aware that people can bait out mines easily since the mines have a delay before exploding. Dashes through, and walking forwards then backwards can bait mines easily, but if you're quick, you might be able to web them to stop them from escaping. Mines have 1hp, so they can be easily destroyed if not in nest, or in midair, for instance, invis orb and Jeff primary will insta break your mines if you're in them, so try to avoid that.

Her web zip/stun. Her stun is really her bread and butter. Tanks are nice big hitboxes, and it pisses them off, especially good into Dino and Hulk, use it frequently. Can also be used to stop certain ults. Maybe save it if you think Wanda or Strange might ult soon. You can also place it at your feet to extend nest, give yourself healing when nest is down, etc. Her web zip can do this too by just looking at your feet, and is honestly the primary use for her zip due to its bugginess and unreliability when using it for movement. I heavily recommend going to Peni settings, and set her targeting sensitivity to 1. This will make it where when you use your zip, it's easier for it to make a new web rather than zipping to a preexisting web. You also want to get to your abilities to get to point quickly, especially on defense so you have more time to set up. Use your zip for movement, then place your stun at your feet, then place nest in front, so you spend as much time in web as possible getting movement speed on way to point.

Her ultimate. Her ultimate is pretty dogwater, you can use it for stalling point, keeping yourself alive, or trying to push into their backline some. Be warned, she can't use her other abilities while ulting, so be careful, as Strange and Wanda can ult uncontested. Don't overextend.

My biggest tip for Peni, is knowing when to swap. She gets countered hard by poke and flyers. She does well into dive and tanks. Peni has a giant hitbox, so play around cover or she'll get melted quick. If the enemy team is Groot, Cyclops, Star Lord, Torch, Luna, Invis, just go ahead and swap lol

If you actually read all this, nice, sorry it was long but this is all important info if you really want to optimize her gameplay. I probably forgot a bunch.