I like this one alot. it looks like your line work is comin along. I saw where you were havin some issues with cracks in your paint when your mixin paint pens with acrylic. It won't really matter if you do oil over acrylic it's when you put acrylic over oil that you start having issues. I don't mean to pry and please don't think I'm being nosey but I use alot of acrylics and I find they work better when they're on panel. And I would definitely recommend priming your surfaces with an acrylic gesso Nova Color and Golden make really nice ones, this will give the acrylic a good base to adhere too and give your paintings longevity. What acrylics are you using b/c that could have something to do with it as well? Utrecht is a nice middle of the road acrylic if your looking or nicer stuff go with Golden, Liquitex, or Nova Color. I hope this helps.

Cheers for the imput, i always like to have people giving me that little help/guidense where needed! seriosly apreciate it dude, its wierd actualy coz it wasnt cracking with any other of my Posca paint markers or anything like that, it was just one pen that was doing it? wich i didnt understand. so i crack open a new pen of the same kind and its stoped...so i got a dud pen i reckon. but i will still defo take on board what you have told me cheers

yeah sucks when you get a dud pen. I can't tell you how many I've gotten.