You can check out the rest of her sketches/drawings here:
Ricardo Actus is another artist that really inspires me when sketching, too. His artwork and Irina's artwork are polar extremes. Irina's is much more clean, crisp and bold, whereas Actus's is a lot more sketchy, emotional and realistic. Both are very expressive and flowing. Here's some examples of his work:
To check out his artwork click the link: http://naoacendaasluzes.com.br/
Both of these artists are different yet they both create artwork that is expressive of their selves. They have different styles which are interesting and emotional, in my opinion.
I'm still working on my sketchbook and I find myself going back to pencils, but I never experiment enough. I plan to work with more media, create interesting pieces and try to put some sort of emotion in them. That's the hard part. Placing my emotions on paper and expressing it.