That "Japanese style" looks very unreadable and I don't think would age well, but I think that'd be more down to the specific style and artist than traditional Japanese tattooing generally.
But, yeah, what @JAC1961 said.
It's very unlikely that you will develop enough muscle in your forearm to affect the tattoo. Maybe if you get as big as Arnold, but not many people have the discipline, or more importantly, the genetics, to get that big.
I can’t read that top one as a print, let alone applied to skin. All tattoos definitely do blur and fade over time, but a well made tattoo will acquire character as it ages while a poorly done one will turn into a blob. Sent from my iPhone using Tapatalk
The bubbles are perfectly fine and normal. You are capturing normal body fluids and keeping foreign material from getting into where those fluids are emanating from . . . except when you pop bubbles WHICH YOU SHOULD NOT DO!