I've tried to do double exposure with my holga but it was way too exposed after and for some reason, all the remaining photos were overexposed (I think I break something... ).
I like yours! Beautiful!
yes, i do doubles with my holga all the time--but it's tricky. the overexposure part can happy easily if you have a lot of lightleaks. is your holga working ok when you only shoot one exposure? if so, you may just want to tape it up before doing double exposures, and use 100 speed film. it could be that your shutter is slow on the holga. my holga shutters are very fast, (i have two--one for 120 film and one with a polaroid back), so i can do doubles without too much exposure.)
thank you again )