Hantom - I just wrote this for another poster and thought it would really help you...
Steve here... a retired university art professor. Here is something you may want to consider. The impressionist Renoir was asked his opinion on the best way to learn to paint. He said "It is in the museum that one learns to paint... it is in the museum that one gets this feeling for painting that nature alone can not give". Renoir did not mean go to the museum to be inspired or get a warm fuzzy feeling, he meant go there, choose a master painting, and COPY IT! Don't try to interpret it, or change it up a bit... no, he meant COPY. By copying someone who has already translated a scene in 3D to a flat painting surface with paint, you will learn how it is done. You will not need to ask anyone how you are doing. You can compare yourself with the master and see for yourself. Otherwise, I think all other feedback is subjective.
Then, as you gain confidence and skill you can begin creating your own paintings instead of just doing copies. You do not need to go to a museum, get a high quality print of a painting to work from. Most of my students went out on their own after 2-3 copies.
If you are unsure of how to mix colors, all you need is 5 colors. I have attached a guide I gave to my students.
Oil Mixing Guide.pdf