Wow this is amazing for your first attempt at orchestra! My favorite part was at 01:25 :)
EWQL is pretty awesome, isn't it? Even though some might say it's a bit "outdated" I still like to use it in my projects as well. I really can't wait what masterpieces you will compose next now that you have an orchestra at your fingertips :P
Try not to add too much reverb on EWQL Symphonic Orchestra most of the samples already sound pretty wet (I usually like to add just a slight bit of extra reverb, usually about 20%)
as for panning most of EWQL Symphonic Orchestra is already pre-panned in a way but it's never wrong to make adjustments :)
Also don't be afraid to raise the levels a bit more with the percussion.
Can't wait what more you have in store for us with your new library :)
Nice work man!