Hey Rodrigo, it's bex here with your requested critique!! So straight off the bat I've noticed that composition is most certainly your strong suit. I'd honestly compare your comp skills to that of a senior artist at least. You generally seem to know where to place people and text pretty well across all graphic types. What we'll be discussing in this critique will be text and style!
At the moment it would seem that your weakest point is text, but don't worry, you're not alone! Everyone struggles with text - from MAs to master, it's the bane of every artist's existence. This graphic is a good example of what text should look like++, it's very clear - it's proportional, and you've used a colour from the graphic. I notice that you use whites a lot in your text, I'd generally advise against this. Lighter colours always work very well, but anything too close to white can sometimes be a little too blinding, take away from the focal point - and it can look out of place because it doesn't match the colour scheme. The same goes with neon colours, when you use them in a graphic your text becomes difficult to read. I'd also try to limit how many fonts you use on one graphic to three, perhaps? If the fonts are placed well like you have in this++ and this++ it works, but when they're all on top of each other it can be very difficult to read. The main text on both graphics here++ is difficult to read because there's so many fonts on top of each other. My general rule of thumb is to use one downloaded font as the main text, and one pre installed fonts such as arial, times new roman, or Georgia (as an example) for quotes. Sometimes I mix it up, but you have to be careful using some fonts as quotes because the smaller they are, the harder they are to read. This is why people use arial as a quote, because it's so simple and clear. Lastly you seem to use chunky and blocky fonts, which is good, but you use them in most of your graphics. I'd suggest mixing it up again - because it's important to choose fonts that are cohesive and match the theme of the graphic. Similarly if your graphic is predominantly stock based, then use scripty fonts and if you use textures - look at using brush or blocky fonts.
As a junior artist, I would say style isn't important at this moment in time. I would say that you have to look at perfecting your skill first and that through trial and error a style naturally emerges. I would rather make graphics well and have no style, than have a very well defined style but still have problems with colouring or blending etc. That being said, I personally think a style emerges rather early on - and I can see your strength in textures and simplicity, so I would experiment with minimalism and new textures in the future. Remember to constantly keep downloading new resources and using different models, because then a style may emerge - rather than using the same stuff and just becoming repetitious.
as this is rather short, I thought I'd leave you with a cleanout. These are all just suggestions, you can of course ignore me seeing as it's just my opinion and I'm not an admin etc etc
banners: one* two**
* - I know this is a very new banner, but the light background against the dark hair of the models can show even the slightest mistake in blending and make it look visible. In this case the main girl's hair looks a little choppy. As well the penname is totally unreadable, I'd change the font and the colour if you were to keep it
** - the white and neon coloured text is a little too bright, and the blending is a little too sloppy
signatures: 'evans stole my trousers' - the font choice doesn't work for the graphic, nor does the colour.
chapter images: one - the white text and the use of too many fonts doesn't work
I think that your skills are coming along quite nicely! You've got a wonderful eye for composition and colouring - and I really like that you can use both stock and textures. I would say you need to work on text a little bit more so that your pieces can come together, and think about perfecting all the things needed for a good graphic before considering style. Lastly, you asked me about your gallery design - and I think it works. From what I've gathered over the years, so long as a design isn't too complicated or frustrating then it won't hinder you in promotion. It looks clean and organised, I like it! If you have any questions or think I've been to harsh, please feel free to PM me!