A bowl of lemons and an orange

I drew this just today.
I took about 15 minutes to sketch this, and I must say this is a really quick sketch. The proportions are just fine, and the shadows are just visible. I had to note the tone difference and highlight the contrast between the fruits and the bowl. I used F, 2B, 3B, 6B and 4B pencils. I feel that there could be an improvement in the blending of the shadows though.