Help with choosing frame size and fit please

Hello and welcome to the sport!  I don’t think the fit looks too bad but you can definitely tweak some things to adjust the fit.  First of all, when you stand over the top tube do you have any room in between you and the bar or are you physically touching it?  Because if you are going up a steep hill and try to get off, the bar will be higher than on level.  Can you stand over the bike and pick it up off the ground an inch or two?  If you do have room, the first thing you could try would be to loosen the Allen bolts on top of the seat post and you can slide the seat forward a little so that you are closer to the bars.  If you still want the bars closer you could go with a shorter stem to bring the handlebars closer as well.  You can also raise or lower the height of the handlebars on the steerer tube if needed. I’ve managed bike shops for 15+ so fit more people to bikes than I can count but over the internet and one pick can make it tough. 

Congrats on the new bike. The fit looks great to me! You can ask the shop if there’s room to ad more spacers under the stem or a taller rise bar. Make sure the bar width is cut to size. Probably like 750-760mm for your height? This will also make you “reach” less.

Yoooo! Always stoked to see more people get into this world of two-wheeled stuff! Especially this mountain biking side; the obviously superior two-wheeled pedal machine!

I'm NOT someone who knows much about bike fit. In fact, I may have gone with a slightly too-small first bike and now - on my second - I think I have some sizing and some preferences figured out for myself.

One thing I wanted to mention, though, because it's hard to tell from your photo: check your saddle height. There are a few ways to get there (and maybe @Whattheheel or anyone else can chime in with their best practices) but I had the wrong saddle height for a while and that was annoying.

I dropped a video below that talks about finding your saddle height. I just use the first method described in the video (the Heel Method) but I'm also a bit of a caveman when it comes to bike setup. I just ride whatever feels good and this method has been good for me and left me with a comfortable saddle height on both bikes. Good luck!
 

Hey Amanda, so you’re standover sounds about right for your size and just going by your pic if you went to a small then the handlebars would be an inch or two closer to you and I think you’d be way too cramped especially when pedaling and turning corners as the bars would be way to close.  I’d say ride it some more and if needed swing back to the shop and see what they say.  And I agree with Dontworry on the saddle height heel method, that should get you very close and you can tweak as you go.  One thing I would look into when you are ready is a dropper post.  I cannot and will not ride a bike without one.  I have lost count of the number of frames i have drilled holes in or cobbled together a solution just so I can run one.  Such a gamechanger.  Carlin, on that level of bike most of the bars are already in that 740-750 range as they rarely get up to 800 until you get into the higher end bikes but that is definitely a good idea to check!  Have fun Amanda!

From a frame size standpoint that fit looks great, plenty of good feedback given here by others for dialling the fit in once you get some km’s on the bike.  

My OCD is kicking in a little and i would recommend double checking your rear wheel quick release. I typically try and position it so you can tuck the lever in to the rear triangle… back and down it might be bumped and lose tension.  Again, just my OCD…