Re: Adding brushes to your image
Nice job on this. I noticed the one blood splatter on the right side of the tub was used twice. Something I have recently found is how to rotate the direction of the brushes to help change them up a bit.
On the right side of the top bar there is a "file" looking icon. Roll over it and it says "Toggle the brushes pallet". (It's on the opposite end of the info bar for the brush size and opacity settings - and almost center.) Click on it and a box pops up. On the left top click on "Brush Tip Shapes".
Aside from just changing the diameter size, you can now rotate the brush so that it is not the exact same each time you use it. You can also "flip x" and flip z". You can change the "roundness" to distort the original shape a bit. I set the spacing to 1000 so that I can see what the preview of the changes are.
This is also very helpful when wanting to use corner brushes. Just use them at the 90 & 180 +/- angles.