Random Rumble

I just bought a box of cool grey ShinHan Art Touch twin tip markers. Somehow there are two 120 black in the same box so I went online to check if it's normal. It is. Hm. I don't know, but isn't 0.5 grey the one that'll be most likely to run out first? I mean, line draft is made with 0.5 grey, isn't it?

Trying to find a tutorial now. How come I can find practically nothing but manga/anime drawing tutorial? I bought those to draw robots and cats! There are generic marker drawing, but feels just like generic drawing to me.