Help on creating a University thesis cover

The following redefines maketitle (you might want to hide the definition in some other file to keep your main file clean). This is just a sketch of your title page and might need some more fine tuning to match your formatting better, but it should get you started.

I defined the macros myspecialty to set the specialty. It takes an optional argument defining the thesis type (should be either doctoral or master). The mandatory argument can be used to specify the specialty. If the value is security the "Doctoral Degree in Law and Security" is used.

The other macro I defined is mysupervisor to directly specify the supervisor.

You can use the normal macros author, title, and date to define those elements.

You might want to change the example-image-duck to the actual logo you need to use.

documentclass[a4paper,12pt]{report}

usepackage[]{graphicx}

ExplSyntaxOn
cs_new_eq:NN textuppercase text_uppercase:n
cs_new_eq:NN strifeqon str_if_eq:onTF
ExplSyntaxOff

makeatletter
newcommand*@myspecialty{}
newcommand*@myspecialtytype{}
newcommand*@mysupervisor{}
NewDocumentCommandmyspecialty{O{doctoral} m}
  {%
    gdef@myspecialtytype{#1}%
    gdef@myspecialty{#2}%
  }
NewDocumentCommandmysupervisor{m}{gdef@mysupervisor{#1}}
RenewDocumentCommandmaketitle{}
  {%
    begin{titlepage}%
      begin{center}%
        includegraphics[width=.3paperwidth]{example-image-duck}par
        vspace{1cm}%
        {largetextuppercase{@author}par}%
        vfill
        vfill
        {Largebfseriestextuppercase{@title}par}%
      end{center}%
      vfill
      nullhfill
      begin{minipage}{.5linewidth}
        raggedright
        strifeqon@myspecialtytype{doctoral}%
          {%
            Thesis to obtain a Doctoral Degree in
            strifeqon@myspecialty{security}%
              {Law and Security}
              {Law, in the specialty of @myspecialty}%
          }
          {%
            strifeqon@myspecialtytype{master}%
              {%
                Dissertation to obtain a Master's Degree in Law, in the
                specialty of @myspecialty
              }
              {PackageError{mytitle}{Unknown degree type @myspecialtytype}{}}%
          }%
      end{minipage}%
      vfill
      vfill
      vfill
      begin{center}
        Supervisor:
        @mysupervisor
        vfill
        @date
      end{center}
      vfill
      null
    end{titlepage}%
  }
makeatother

begin{document}
author{Author's Name}
title{Thesis or Dissertation Title}
myspecialty[master]{creating titlepages}
mysupervisor{Dr. Maria da Silva, Professor of the NOVA School of Law}
date{today}
maketitle
end{document}