If you prefer scary make-up for Halloween, fake blood is a good idea, it is super easy to work with and it will be very effective! You do not have to be a professional to get a nice Halloween make-up when you have fake blood if I say so :)
If you have blood, you can dress up for anything and get it scary, an Easter bitch who cries blood, a princess with blood running from her mouth, a bloody grumpy cat; ) You get the point!
Painting the water link red with a red lip pencil and then "crying blood" is an incredibly effective and fun make-up, you can also just let it flow a little from your mouth if you do not want so much. Here are two different Halloween make-ups with the details, the first make-up can be almost any costume and the second feels a little more vampire:
Less is more is usually not my motto but when it comes to blood I actually think it is so, I do not know if it is my aesthetic eye that says so or if it is my brain that feels bad from blood that makes me to think so haha.
Hope you were inspired! :)