The pine looks good in it's original condition, it complements the (somewhat) 'industrial' look of the brackets.
Looking at the pic above, have you given thought to the fact that each bracket has two screw fixing holes which, in turn, means that a single screw has to bear the weight of 1/6th (as there are 6 screws into the wall) of the shelf contents + the shelf + the bracket. Please don't misunderstand me, I'm not criticizing your work, but have you carried out a 'dry run' on how much weight the fixing screws will bear by using an equivalent weight of books/bricks.whatever + ?%? I know I can get a little paranoid about such things at times but the R/H bracket is subject to more load stress than the other brackets as it's further spaced than the others.
Have you identified all the studs or are there more you have not marked? The sole reason I didn't use the style of brackets that you have used is that the diagonal support would get in the way of BB's on the next shelf (unless the shelf spacing is greater) down so I had to double up on brackets which are not as robust as the ones you are using to compensate - but I didn't have to rely on stud anyway. What is the spacing between the drywall and the wall behind (stud thickness) and what is the structural wall made of (if I may ask)?