I like the depth of field in #3. You can experiment by taking the same photo 3 different times with 3 different f-stops...see what you get.

#4 is my favorite...the shadows in general...the shell shadow as the needle.

#7 has potential. I would like to see some more light, maybe coming from outside at an angle that creates some shadows.

Several shots make me want to play tabla. ;)

Enjoy the learning process! I can't wait to see what will come next.