Thank you, OddYouko!
The pencil sketch for the Adahy picture took me about an hour, I think. Drawing the lineart on Photoshop probably took me around three to four hours or so (I'm picky with lines, and work with big sizes too). The coloring... hm, in this case it was the longest part because I tried out a few coloring styles before I decided to leave it the way you see here. Probably, it took around six hours, but I don't know.
I should check the time when I do art now that I think about it. Sorry, I can't give good answers.
The things I needed for journal design are made with arts which were already done, I only added and changed few things about it. This took less than an hour.