Regarding the skull, when drawing something from a front view (and not only from front) its a good thing to flip your image now and then. Helps to see if everything (proportions) is going well. Now it turns out that the right side is larger then the left side.
@Ivan Turcin - Thnx for the tip, I'll definitely use that more often ^^
@NakedZergling - Thnx
@Malakuko - Thnx, working on couple of stuff atm, tho kinda busy with college and all, but i hope to post some more up here ^^