Hey Moises,.....I think that looks just GREAT!
If you are new to oils, you will soon be a talent to be noticed!
You are probably realizing that the primary difference between oils and pastels is that you will need to do a great deal of mixing of colors, compared with pastels. I understand that with pastels, one just picks an appropriate color from a vast array of possible colors, whereas with oils, you will MIX the color you require from a comparatively limited palette.
One can get by quite easily with having a palette of perhaps 7 colors, including White and Black, in oil paint. If properly selected, you can match nearly any color in nature, or from a reference photo.
I used to teach a class in oil painting, and for our palette, we used the following colors:
Cadmium Red Light (or medium)
Cadmium Yellow Light
With only this selection of colors we were able to match nearly any landscape from reference photos. M. Graham offers wonderful paints whose binder is Walnut Oil. The great, unsung "hero" of oil paints, and the most bang for the buck can be realized with Grumbacher Pretested Oil Paints. Their binder is Linseed Oil. Both are reasonably priced, and are excellent regarding their handling.
If you wished to add one more color, I'd choose either Anthraquinone Red (Permanent Alizarin Crimson--PR177) or perhaps Thalo Blue (PB15). This may depend upon the subjects you might wish to paint.
Your painting here exhibits a rather excellent knowledge of color, so I imagine that you will experience much success in the mixing and managing of colors when working in oil paint.