I attached a card that I just finished last night as I had to go out of town on sunday and didn't get to play. When I do my shading, I start with a darker complimentary color around the edges of my image and then color in the rest with a lighter shade and then use my OMS and blender stump and blend the 2 together. I also tend to use an eraser that I bought at a local art store to erase certain parts to help highlight it. This is an easy and fun way to help you shade. IMO.
As for my OMS, I use a bottle I bought at Sally's Beauty supply. It works great! it's a plastic pump bottle that you use for removing nail polish and other chemicals for cosmetic purposes. BUT, it also works perfectly for the blender stumps b/c all you have to do is pump it a little and the oms sits on top in the cap. It absorbs back naturally so, you don't have to worry about it staying in the lid. I LOVE it! it's made my life so much easier. I'm going to include a picture of it as well. HTH!