Yeah, stickers can suck. It's something you can get better at with experience though.https://www.amazon.com/Gundam-Gm01-Black-Fine-Value/dp/B00GRKPNUE Yeah, something like this will do wonders, TBH. If you want a kit that has a lot of things you can use it on to make stuff pop, try the Heavyarms HG kit.
This. Even just a marker will make it pop.