J. Sketchbook

[florentK]

keep it up. You can also make black and white value studies just before colors studies. it will help you to add more realism to your studies. try to find some inbetween values (more gray ones) . I m not a super pro in color but gray tones are very difficult to find but are the most interesting to apply.
For example for your last one , you have dark colors and very bright one. If you grasp some in between values it will help you to define your rock ground or even the wood.
like as said..i m not a super pro i m just tryin to help you :) keep drawing :)