I second what Tojo said. when you feel you are ready, an airbrush is a game changer and will raise your build quality by leaps.
I have been modeling for 35 plus years and in that time I have owned and tried several airbrushes. I currently own 4. In the past I would have recommended a simple single action airbrush like a paasche H or a badger 200 or something similar. These tend to be high quality, easy to learn, easy to clean and use, give very good results and are usually around $100 for airbrush and compressor.
As of late I have changed my recommendation since airbrushes have progressed so much. If you decide to get an airbrush and are willing to spend around $400 for airbrush and compressor consider a Grex Tritium Ts2 or Ts3 side feed.
I own this airbrush and had I to do it over again I would have got this one first. This airbrush will allow you to skip a couple of teething steps in learning to airbrush and you will have an airbrush that will grow with your skills and you wont hit its limitations since it is really three airbrushes in one.
One, it is a double action airbrush that works and has the simple and short learning curve of a single action.
The side gravity feed cup swaps for left or right hand use.
Its a pistol grip so your hand feels natural from the first use.
Easy to clean
Shoots all types of paints.
Comes with three size cups.
Cups rotates so you can paint straight ahead all the way to straight down with no spilling and the cups have caps
You can add optional larger and smaller needles and also a fan spray cap so the airbrush goes from fine detail all the way to a broad spray gun.
Uses standard 1/8" connections, no special sizes.
Adjustable needle stop so you can set how much paint will spray at full trigger pull
Very fine atomization, like a mist so the paint goes on very smooth.
I use this gun for 80-90% of the time now. There are some videos on youtube you can watch to see the airbrush in action.