Yeah sure!
These are actually the first two things I've painted in like 25 years, so please keep in mind that I'm still well in the (re)learning phase.
I use acrylics exclusively. Undercoat is sprayed Citadel 'Chaos Black' but for my next one I might use 'Leadbelcher'.
I have a small but growing collection of Citadel and Vallejo acrylics, which I brush on but I'll start airbrushing some bits once my airbrush gets here and I get used to it.
For the paint chipping, there's two techniques I tried:
Soap Technique - rub a bar of soap on corners and any bits that you don't want paint to adhere to. Wash it off after your top coat has thoroughly dried.
Hairspray Technique - spray hairspray over your base layer after it's dried. After that's dry, paint your topcoat over the top. Once that's dry, moisten your top coat with a bit of water, and with a slightly stiffer brush, start working over the areas you want the paint to come off. You can 'encourage' areas by scratching them with a wooden skewer or similar. Just follow the tutorials on YouTube, it's pretty straight-forward (if somewhat miraculous).
Drybrushing:
I saw a technique on YouTube where a woman almost exclusively only drybrushes. I mean, literally everything. So I'm experimenting with layered drybrushing where you get lighter and lighter with each application. That's what I did for the copper section on the blaster pictured earlier. It's a great way to bring out subtle details.
Effing Up:
For adding dirt and grime, I'm currently using Citadel 'Nuln Oil' and Vallejo 'Streaking Grime' Environment acrylic. I add in small amounts of different colour acrylics to vary the color and opacity. I love the Vallejo Environment acrylics! Will definitely be getting more.
I just rub paint in the creases and either wipe it off with tissue, or dab it with a sponge. It's not hard, it just takes a bit of courage
My challenge with my next model is to show some restraint. I think the sandy coloured side of the blaster above is just taking it a bit too far.
Next project is a Hammershot, so Vim, I'll be using your example of a few pages ago as inspiration!