Yep you mentioned that it's yer first time. And I'm tryin' to give constructive criticism.
Did you blow out the garage before you started?
Like I said, Looks good.
Also, no amount of precaution, will insure a perfectly clean job.
I painted a pickup several years ago. Two tone,black/silver Acrylic enamel. Turned out nice. (even amazed myself) Backed it out, washed it, dried it, called the customer to come get it. As he was pulling up a bird flew over and did what birds do. Crapped on th' hood. I washed it off, but it had already printed it. Thus ruining a decent paintjob. I swore off of Acryilic enamel, unless it's a work vehicle needing a cheap shine. Or I have time to let it properly cure.