Hi,nice to see it’s kinda working 
About your beast,I know you’re not going to finish it but it would be a good learning for you to just;
Scale the model up so you can get a nicely customizable shape for your tweak magnet,get into Tweak Mode/Vertice,activate the magnet and click(don’t drag yet) on say the vertex in the middle of the chin,hold the mouse button and while you do so,scale the magnet up and down using the - + keys until it grab part of the vertice and leaves a few unaffected,then just move the move to tweak but don’t let it down yet,you can still scale the magnet up to fine tune the selection(which can’t be perfect right away anyways) do this a few time from different angels and keep an eye not only on the mesh itself but also and most importantly it’s Contour/Sihlouette so you get a nice view from all angles.
Now I reckon you probably know all of this which brings me back to what I’m getting to…Give yourself Fifteen minutes or even less to tweak it,go nuts,don’t even add any topology,just give him over-exagerated shapes(like a very pronounced jaw) while always keeping the magnet from distorting the rest of the neighboring vertice.You’ll learn tons by doing so.
That’s why it is much prefered to setup the basic shape and topology then finally move it around and have it reacting as if you were manipulating a real skin 
I use the tweak mode and standard operations with edges and faces as much as with vertice, depending of how much surface should be move and how.
Hope this helps somehow