Hello Calin (sau salut :)) )
Your design is nice but I recommend you some typography tutorials. Learn about contrast, colors combinations and font combinations. Also, you have spacing problems.
Add more space between icons, subtitle and description. They are almost merged.
And about icons: use the same icons from a icons pack or if you use from different packs, be careful. They must be appropriate, matching their style (line icons, flat icons one color etc). Check some HERE or HERE. They are packed. For this king of flyer look for some “business icon packs”.
Alignment: it seems that the logo on the top badge isn’t really on center and also space between logo icon and text.
Fonts: if you check some typo tutorials there should be some fonts combinations. Use two fonts: one for title and a base font. I use for websites something like “Montserrat”-headings + “Lato”-base font. HERE and HERE are other links for you.
Good luck and keep working. You’re doing nice work! 