You are making it look easy. I am now looking forward to seeing how you handle the next batch of assignments after this one. For the remaining images I would like to see you really challenge yourself. I know none of these are easy, and I just want you to think about it. You are hitting that mark of consistency and accuracy (the texture in the Shishkin is excellent btw...), that tells me you need to keep pushing and reaching to challenge yourself. Perhaps choose images with dynamic figures in them or challenging perspectives. It's up to you.
Keep up the great work.