Zbrush Expressions

After finalizing my model to a point I was reasonably happy with I began creating my expressions. I first clicked the sub tool that I wanted to use which was the face. I then went into the layers panel and created a new layer naming it original. I would never change this layer as it would be my base layer and it would always remain on zero, meaning that it would never change position. To create the expressions I copied the original layer, renamed it with as detailed name as possible so I didn't get confused using the name button and then pressed the record button next to the layer. This allowed me to sculpt onto the model to change the expression using the brushes such as move, clay, smooth and once I had finished I pressed record again to stop it recording. This seems a fairly simple process but I often found myself sculpting when I hadn't pressed record and then having to undo and repeat the process with the record button turned on. Now when the slider was at 0 the expression was the same as the original layer, but when I moved the slider up to 1 this gave me a new expression using the position that I had just sculpted. I created different sliders repeating the above process and doing one for each side of the mouth separately for a smile, each side of the mouth separately for a frown, each eyebrow separately and so on until I had a range of sliders. I could then use a combination of these sliders to create the expressions moving some of them only part way, as the expressions I had created were very extreme for this purpose. I had also created an open mouth slider, but this posed a problem as it opened the mouth, but since the teeth were on a different layer they stayed in the same place. To correct this I had to go into the teeth sub tool and create another slider just for the them, which was easy enough, but when it came to producing the expressions I had to keep going back and forth between sub tools which became tedious. Below are the range of expressions that I created in Zbrush. I ran out of time to do any more which was disappointing and some of them haven't worked as well as others. Another problem I encountered was when sliding the layers some of the in-between positions were really strange probably because I hadn't re-topologised my model. I hadn't done this due to time constraints, but also I didn't think it would matter as 3D printed models don't necessarily need re-topologising. If I had had more time I would have done this but overall I'm still fairly happy with the results.