I'll be nice as it's your first, so I won't bother going on about heartlining or anything like that, but there are some things that must be addressed. It's far too fast and those G-forces are obscene. Keep it between -1.5<v>4.7 and laterals as low as possible. Your turns need lead-ins and lead-out, where the radius tightens, reaches the tightest radius for the turn and then gets bigger again, instead of just flying straight into the turn. Most of all though, curved break runs are a massive no. Magnetic breaks can be curved vertically, but no lateral turns should be breaked (unless you're building an old Schwartzkopf).
Keep at it, you can't expect to be good overnight, and getting out of 'RCT mode' is hard, but if you keep practicing and experimenting, you'll improve rapidly. Look at real coasters and try emulating them, and other people's NL work. On here there's only about 3 or 4 regular NL users, but places like NL Exchange would be a good place to look around, there are some great rides to download on there.