Hi, I really like the drawing in the front section, with good use of shading to create a good representation. However your perspective in the back section is not right. I recommend that you look at some internet drawing sites about TWO-POINT PERSPECTIVE. Drawing books on this subject would also be a good resource.
May I suggest a technique for checking angles and widths for perspective. Hold your pencil horizontally in front of you at arm's length, on the same angle/level as one of the bottom edges of the building or photo of the building. Then whilst holding your pencil in this position rotate your body to face your drawing, whilst holding the pencil at the same angle to compare. Repeat this for all your horizontal lines and hopefully you will begin to get an idea of the correct perspective. You can also use this technique to compare the all the different lengths in your drawing, i.e. the width of the front of the building compared to the length of the back section. Is it half as wide or possibly a quarter of the length ? Similarly you can measure the heights of the back wall - compare the height of the wall at the corner near the verandah to the height of the same wall at the far left - the height at the far left should be less because it is further away from you. All your vertical lines are good. Please don't lose hope as it takes lots of practice to master perspective. Some variation in texture in the foliage of the trees and grasses in the foreground would also help you drawing greatly.
In regards to your composition, it is advisable not to place the building right in the centre of the drawing as this tends to make an image boring. Think about placing more space at one side, possibly on the right side with a large tree next to the building. Vary the spaces at top and bottom to make it more interesting.
A good exercise to understand two-point perspective would be to place a box on a table and practice these same techniques.
Hope this critique is not too confusing for you. I congratulate you on your endeavours and wish you many happy hours of drawing.