hey there..since your channel is almost as close to what i do on mine, you could ask your viewers at the end of your videos if they would like to request for a specific art tutorial or get them to request for speed arts of their choice. Again youtube is really about building relationships and what you want to do is get involved with other channels similar to yours, enjoy their videos and leave genuine comments..do collaborations just to engage a little bit more in the community. Once you have that going, you will have more people wanting to know you and engage with you on your videos. I started off like that when i had little subbies and till today, i have the same people that i had a year ago still watching and leaving some lovvveeee on my vids. Good luck