Getting tattoo over scar(s)? (photos)

I had to remove 5 moles from my back in June (1 on left scapula) and August (4 on the right side, but got 2 of them removed together) last year and seems I've got a hypertrophic scarring. They aren't raised, itchy or swollen at all. I was looking online and I'm thinking to cover up that left scapula scar (I would leave those 3 on the right as it is) with some tattoo design (I've made digital mockup how I imagined it). Is 1 year enough to put a tattoo on it? Are there any risks? Thanks in adv.