the thing to remember about burns- if its that bad it will be blistering bad, a bit of latex which you pull up to look like poped blisters and some gliserin (sorry spelling isnt my forte) to make it look like they weeping will make a big difference.
the second one is realy interesting, have you thought about doing that over the whole body and make an alian or mythical creature?
it looks like you have great potential tho keep going
and remember- when in doubt... look up a medical jurnal, the pics are awsome (i keep a file of pics of me and my friends cuts and bruses and document them over time- big thanks to my sis who could get hurt standing still and has had some spectacular injuries over ther years)