2B won't do it, you need HB additionally. That's exactly the dark l get to the real drawing - it's not only the photo. If my paper was real good I would get it even darker but this is a sketch paper and breaks quite fast so at some point I must stop and call it done. Also, pencils need to be real sharp and need to sharpened every 5 min to reach dark enough.Ooh thanks for the tips @Grapes I'd presumed hb was lighter.. I'll try that later and sharpening.. thank youJade, thank you!2B won't do it, you need HB additionally. That's exactly the dark l get to the real drawing - it's not only the photo. If my paper was real good I would get it even darker but this is a sketch paper and breaks quite fast so at some point I must stop and call it done. Also, pencils need to be real sharp and need to sharpened every 5 min to reach dark enough.

@Joy 
Joy, thanks@Joy
This penguin is quite sketchy and was not so much work. I'm spending lazy moments of the afternoons drawing these wonderful references meanwhile watching series/documents on tv. That's how they get done.
What I lack the most in my penguin is the work on the light areas which would mean 2H but I was was too lazy to open the drawer and pick up my H's. Instead I used 2B for the lights. Maybe for the next one.