1. I like oil paintings better than watercolors.

2. I like oil painting better than water colors.

(Which one is correct, #1 or #2?)

3. I have two life stills, a portrait and three landscapes.
(Is this one correct as well?)

4. I go there to see still lifes which I like the best.

5. I go there to look at portraits. It is fantastic to see famous people's portraits.

6. I go there to see landscapes which make me thrilled.

(Are they all grammatical?)

1 is correct. http://www.answers.com/topic/watercolor

"Watercolors" is one word.

3 -- I have two still lifes, a portrait, and three landscapes.
http://www.answers.com/topic/still-life

4 -- need comma after "lifes"

5 is fine.

6 I go there to look at landscapes, which thrill me.

1. Both #1 and #2 are correct, but there are some slight differences in the sentence structure. #1 is written in the form of "I like oil paintings better than watercolors," whereas #2 is written as "I like oil painting better than watercolors." In #1, "paintings" is a noun and "oil" is used as an adjective to describe the type of painting. In #2, "painting" is a gerund noun form (a verb + ing form) that functions as the object of the verb "like," and "oil" is again used as an adjective to describe the type of painting. Both versions are acceptable, but #1 is more commonly used.

3. The sentence "I have two life stills, a portrait and three landscapes" contains a typo. It should read "I have two still lifes, a portrait, and three landscapes." "Still lifes" is the correct plural form of the noun "still life," and the word "life" should be "lifes" to match the plural subject.

4. The sentence "I go there to see still lifes which I like the best" is grammatically correct. However, it could be improved by rephrasing it as "I go there to see still lifes that I like the best." This version uses the relative pronoun "that" instead of "which" to introduce the dependent clause that describes which still lifes the person likes the most.

5. The sentence "I go there to look at portraits. It is fantastic to see famous people's portraits" is grammatically correct. However, it could be improved by combining the statements into a single sentence, like this: "I go there to look at portraits, and it is fantastic to see famous people's portraits."

6. The sentence "I go there to see landscapes which make me thrilled" is grammatically correct. However, it could be improved by rephrasing it as "I go there to see landscapes that thrill me." This version uses the relative pronoun "that" instead of "which" to introduce the dependent clause that describes which landscapes thrill the person. Additionally, using the verb "thrill" instead of "make me thrilled" creates a more concise and idiomatic sentence.