YOU CAN DO IT! YES YOU CAN!
I don't have the book for the other bag, but the skull chart should give you a starting place for this one. Is this how big you want your skull to be? If so, then the work is done for this.
As for your name, count how many stitches across the bag will be and see if the letters you want to make will fit.
You can just put it on graph paper, too.
I think your best bet would be to work the pattern flat--in the round would be difficult, at best, for the skull.
You could do your name on one side, your skull on the other and make some side panels. However you put the letters on the chart-across, diagonal, is how you'll knit them up.
I hope this is some help, to start with anyway.