Darki, I used to know this one but it's sooo hot here and my brain is like glue  (that's my excuse anywaylol).  I think it's the grandson looking in the mirror?  Um no I don't think it's right. It's the son?   

 It's a good one ........ please put me out of my misery I'm gonna chew over it all day. 

Kengillard that's great you've started painting, I think you'll love it.  As far as acrylics go I think you can buy a retarder for them ..... it slows down the drying process.   Or you can just keep painting over the picture which you can't do so much with oils.  I've got a very big acrylic painting I did for the loungeroom and every time I get sick of it i just paint over it. lol.