I currently use my smart phone which is a Samsung Galaxy Note 2, it can do 1080p HD videos, with an app you can turn it into a webcam. But I do want to get myself a Logitech C920, but as the phone is doing a job so far, Im planning to stick with it until I invest in a webcam.
ahh yeah daylight bulbs should be fine, you'll have to do some trail and error on setting up the lighting so its where you want it as you draw your comic
Most webcam and camera quality is based on the room light quality, having poor lighting will result in the video feed being noisy and grainy. Even if you buy the most expensive cam there is, if the room lighting is poor, the output will be fine but not the best .
Forgot to mention, if you want to stream to both Twitch and Picarto, you could use restream.io which provides a way to send a single stream to multiple platforms.