IMHO, this is the only one you have set the flash up properly for. (i.e placement) As Ewan said, go back to natural light. Have a look at Spinner's single flash shots. Alot can be acheived with 1 off shoe remote flash.Grant. Getting sick of one flash again.
Just waiting till summer comes round again, might see the sun peak through hopefullyIf your getting sick of the single flash, go back to all natural for a while.. it will be a bit more interesting for you