My painting of lemons, bowl and cloth

I found this surprisingly difficult, but am reasonably happy with it as my First oil painting (other than the Black and White one). I don't think I stained the canvas enough as coverage of the darker paint was quite patchy so I had to paint over it again. And I did blend a bit on the cavass - more practice required to paint distinct gradations from dark to light. And the grid lines are still showing through - do I just need to make them much lighter?

Thanks Ale for this course - it has been a revelation and I am very excited to see what I can do in oils.