I use pretty fine tipped markers to color them. They are very detailed and fine, so using a paint brush would be difficult for me. Specifically, I use these. I recently bought a new set because I lost a couple from my original set, but I bought my original set in 1998. And they still work great. Amazing.

There's certain things re: control that you can learn in singing class. Also, the vocal exercises are good for extending your range and whatnot. I do have vibrato, and I have pretty good control of it. I can ramp it up, or back it down, or cut it out completely. I'm not sure of the biomechanics of it, actually. I've just been practicing with it for a really long time. Honestly, when people don't control it very well, it tends to sound really awful to me. "NEEDS MORE TRAINING," my inside voice screams.

This bit is interesting from Wikipedia:

In the apparatus there are three different voice vibrato processes that occur in different parts of the vocal tract. Peter-Michael Fischer vibrato types defined by place of production:

The vocalis muscle vibrates at a frequency of 6.5 to 8 Hz.
The diaphragm vibrates at a frequency below 5 Hz vibrato.
A combination of the two, resulting in a vibrato whose frequency is between 5 and 6.5 Hz vibrato.

I never thought about it as being so precise. I appreciate that you enjoy singing, though. It can be quite relaxing. :)

u/banditranger · 2 points r/Coloring

Pens dry out eventually. That can cause the uneven coverage.

The pens look kinda like [pentel color pens ](Pentel Color Pen, Set of 36, Assorted (S360-36) https://www.amazon.com/dp/B001E6F108/ref=cm_sw_r_cp_api_ZFAEybC30B4EV). They come in different sized sets depending on how many colors you want. I have a set that is 10 years old and stored properly still works great. I Store my pens laying down flat (not standing up in a cup) and in a plastic bin with a lid.

I have recommended these to many people for a first marker set. Everyone has been happy so far.

The have bright vibrant colors and fine tips for getting good detail.

u/hellosquirtle · 1 point r/Random_Acts_Of_Amazon

I personally use Colored Pencils. They do have these http://www.amazon.com/Pentel-Color-Pen-Assorted-S360-36/dp/B001E6F108/ref=sr_1_2?ie=UTF8&amp;qid=1458885355&amp;sr=8-2&amp;

Someone posted in the questions about color bleed on coloring books.

I found these too http://www.amazon.com/gp/product/B00VY9U9W0/ref=s9_hps_bw_g229_i1

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