Firstly, you forgot to mention the name of texture no 17.

You should also try and focus on drawing the shadows only (and not outline the entire form) so that when you draw implicitly, the gradient will be more clear, although this seems to be a problem only for certain textures and is not a repeating pattern.

Many textures, such as the wood and mushroom one look pretty good so you should try repeating what you did there to the other textures in the future.

Overall, you have seemed to progress well although a little bit of more practice would fare better.