that's dangerous for your lungs t=what you should do is a resin head form and life cast sculpt it make it probably 10 15% oversized so it can fit with some space then more likely should make a 2 piece silicone mould then run a urethane mix in it
not impossible depanding on the piece your gonna have two options either cut prosthetic and do a build up or the edge or matt down your beard the glue it down
well blood color is subject to what it is if real dry red brown hot blood almost a primary red most is red with a little blue tint to it it u want something to look deep plum color is best never black remember in skin tone there is yellows reds oranges n browns in are skin skin about 98%...
looks good but can make it better if you break up the colors more for morenatural look with an air brush some color washes an a tooth brush to do spaceling