Hei! I'm glad to hear it's helping you!
I looked quite fast into some example videos you should check, I'm not sure as I'm not a fan of random youtube videos, and I used to follow lynda/gnomons/digitaltutors before, but these seem quite ok just to have an eye on.
https://www.youtube.com/watch?v=Vl_smoor41M --- really recommend you to check this because this will help you to reach top notch details easily
https://www.youtube.com/watch?v=QjeP5g_R2jQ -- quite short video showing how you can detail stuff
https://www.youtube.com/watch?v=OOAF8VT-YEU --- brush introduction, highly recommend to check something like that or try to put yourself more time to look into
https://www.youtube.com/watch?v=_vbI1P5bpSM -- timelapse of speedsculpt [good to see how others do it and what tools they use and how adopt it to your workflow]
https://www.youtube.com/watch?v=Z5pkwFWWF3M -- another timelapse / quite short, yet you could watch it x2
https://www.youtube.com/watch?v=sf7s-4MDlJk -- long timelapse, but shows some decent stuff, again something x2 speed or just quickly check through something like that will give you an idea and inspiration.
Small tip: when you watch videos how the guys are doing sculpt, try to observe on what tools/brushes they use and try apply it yourself on dummy sculpts.
I see you've seperated the head as subtool, I assume. Well, I'd recommend now to try and focus on it, try applying the methods within videos I've provided.
Things to be considered:
1) REFERENCES. Use tons. Go google -- and google pictures with whatever you want to achieve and observe details and try to apply.
2) Be sure to check brushes video, you will be able to achieve the results you want easier when you know the tool better. Trust me on this one
3) Detailing videos -- this will help you to develop a better workflow when detailing. You will just simply take from 20 different people what you think suits you the best.
Well, if you invest ~4-5 hours just into research, you will be shocked with the results. You are already know the tool and how to use it, and you are on the right track! But go a little bit in depth and you will see how better it is and easier when you know just couple of tricks
. Keep up the good work and keep us updated! I will try to come up with more input, next time I could do some drawover with suggestions if you comeback with more renders. Just be sure to check videos/research the tool now and only then apply the knowledge you get on the sculpt.