Looks like you've got an issue of orange peel. That can come from moving your airbrush too fast or holing it too far away from the model. Sometimes you can sand it out, provided it isn't a metallic or pearl.
Charlie is correct IMHO. The 3-M blue vinyl tape is super. They had 1/4" and 1/8". I got the 1/4". Not too wide to lay down nicely on some curves. You might have to cut the 1/4" some if you're doing really sharp curves though.
If you get a "H", get all three tips. I got mine on eBay fairly cheap. The smaller tip should help you with interior work with the #3 and #5 being what most are using on bodies. You can get the various size bottles at Hobby Lobby and save by using their weekly 40% off coupons. I got a couple of color cups. I use one for lacquers and one for acrylics. They're easy to clean out.
I bought a Badger Patriot 105 and also bought the 0.5 mm needle and tip assembly. It worked well and I turned out a few nice paint jobs. After seeing so many people recommending the Paasche H, I bought on. That was a few months ago. I haven't touched the Badger since. People like Donn Yost and several on Youtube use and recommend the Passche H. Everyone has their preferences but I was amazed at how easily the H is to use and clean.
If it's a gravity feed, empty the contents of the bowl, wipe it out and shoot cleaner through it. If it's a suction feed, remove the bowl/jar and replace with one filled with cleaner and spray it through it. That's what I do.
Welcome Marcos! I was lucky enough, as a US Navy sailor, to visit your country in 63, 64 and 65. We made port in Salvador and Rio each year. Your country is so beautiful, especially the view from Corcovado. The cab ride to the top was an adventure!