HELLOO iamorim!! Hmmm... You seem to be working a lot, but everything you seem to be doing is very random and unfocused... You do a screenshot, then a helmet, then a master study, then a landscape, then you know, you're not really putting anything towards a place of focus.
Ask yourself after each study you do what you learned and what purpose it served. If you want to work as an artist, this can save you a lot of time of reaching that threshhold of skill. If you look at my sketchbook in the first few pages i used to do the same thing, but now that i've started to get focused on just one thing, my progress has accelerated.
Also, i'd like to point you to this thread i wrote a few months ago about practicing drawing over painting. invest in some drawing books like hogarthe, micheal hampton, bridgeman, loomis etc. Try to draw 3d shapes like spheres, cylinders, and cones. that may seem silly, but it is the foundation of what we are doing. It's really strange, but spend a whole day drawing those 3d shapes, and straight lines without a ruler or shift whatever, and you will start noticing things in your drawings differently...
http://crimsondaggers.com/forum/thread-6923.html
You may think it's the colors that doesn't sell this image, but i think it's the drawing part. If you were to overlay your image on top of the reference, would the lips, eyes and nose be in the right place? your colors are actually quite accurate, maybe not the values, but at least the hues are close.
http://crimsondaggers.com/forum/attachme...?aid=76686
You may feel overwhelmed by all the different things there are to do in art... but really pick one thing and just focus on it. Make sure it's something you like too, and it seems you like drawing cowboys and pretty ladies over anything. I like drawing pretty ladies too, so i've been focusing on that :3.
Keep working hard, but focus on something man, and don't be afraid you're missing out on landscapes or whatever; it's best to specialize than to be a generalist especially in this field!